Updated 28 August 2026 · Evidence-led exercise and boxing advice
Are Energy Drinks Good for You? Exercise, Performance & Safety
Energy drinks can sharpen alertness and support performance for some adults, but the useful ingredient is usually caffeine—not the can. The wrong dose can also bring jitters, poor sleep, stomach upset and rushed technique.
25+ years coaching BSc (Hons) Sport Science Google 5.0 · 54 reviews Trustpilot 4.5 · 15 reviews
Energy drinks displayed in a supermarket. Image: Dietmar Rabich; crop by Maartenschrijft / Wikimedia Commons / CC BY-SA 4.0.
Typical reference
80 mg caffeine
About the amount EFSA lists for a standard 250 ml energy drink.
Healthy adults
200 mg single dose
EFSA’s general no-safety-concern level—not a performance target.
Research range
3–6 mg/kg
Often studied in sport, but not a blanket recommendation for every boxer.
Most important rule
Test in training
Never experiment with a new drink before hard sparring or competition.
The short version
Are Energy Drinks Good for You? The Quick Answer
Sometimes—but they are not essential. Caffeine may improve alertness, concentration and some aspects of high-intensity or endurance performance. Whether that helps depends on the dose, timing, activity and your individual response.
The trade-off is real. Too much can cause jitters, anxiety, stomach upset, a racing sensation or poor sleep. For boxing and other skill-based exercise, being more stimulated is not always being more skilful: calm decisions, rhythm and accuracy matter. If you use caffeine, know the dose, count every source, start low and test it in an ordinary session—not before hard sparring, competition or an important workout.
This guide is general education, not medical advice. If you have a heart condition, high blood pressure, anxiety or panic symptoms, are pregnant or breastfeeding, take medication, or are unusually sensitive to caffeine, seek personalised advice from a qualified healthcare professional.
What is actually in the can?
How Energy Drinks Work: Caffeine, Sugar, Taurine and Guarana
Most of the noticeable effect comes from caffeine, with sugar supplying carbohydrate in sugared versions. Taurine, guarana, B vitamins and other additions may make the label look more advanced, but their presence does not prove that the drink will improve performance.
Caffeine
A central-nervous-system stimulant that can reduce sleepiness and make effort feel more manageable. It is the ingredient with the clearest evidence for alertness and exercise performance.
Sugar or sweeteners
Sugared versions provide carbohydrate as well as caffeine. That may be useful in some long or demanding sessions, but it is often unnecessary for a normal one-hour session when you have eaten properly.
Taurine
A naturally occurring amino-sulfonic compound included in many products. Its presence does not mean the drink will outperform a known dose of caffeine on its own.
B vitamins and blends
B vitamins support normal energy metabolism, but adding more does not create instant energy. Guarana is another caffeine source, so it must be counted in the total stimulant dose.
Know what you are taking
How Much Caffeine Is in an Energy Drink—and How Much Is Too Much?
A standard 250 ml energy drink is often around 80 mg, but larger or stronger products can contain 160–200 mg in one container. The only reliable approach is to read the label, calculate the whole can and count caffeine from every other source that day.
Example
Approximate caffeine
Practical meaning
250 ml energy drink at 32 mg/100 ml
80 mg
Similar to EFSA’s reference espresso or standard energy-drink serving
500 ml energy drink at 32 mg/100 ml
160 mg
Twice the caffeine despite the same concentration on the label
EFSA healthy-adult single-dose level
Up to 200 mg
A general no-safety-concern level—not a target or personalised recommendation
Count caffeine from every source
Coffee, tea, cola, pre-workout, energy gels, caffeine gum and another can all contribute to the same total. Individual tolerance does not prove that a high intake is necessary, and a familiar dose can still damage sleep when taken late.
Where caffeine may help
Are Energy Drinks Good for Boxing, MMA and Combat Sports?
They may support alertness, perceived effort and some aspects of repeated high-intensity work, mainly because of caffeine. Combat sports also depend on calm judgement, timing, accuracy and efficient movement, so feeling more stimulated does not automatically mean performing better.
Can caffeine improve reaction time, stamina or power?
Feeling more alert for technical drills
Lower perceived effort during demanding conditioning
Support for repeated high-intensity work in some athletes
Greater willingness to train when genuinely tired
What an energy drink cannot do
Teach timing, footwork or defence
Replace carbohydrate when fuel is genuinely low
Replace sleep after repeated late nights
Make an excessive dose more useful
Are any energy drinks best for combat sports athletes?
There is no universally best brand for boxing, MMA or another combat sport. A useful choice would need a known caffeine dose, ingredients you tolerate, an appropriate sugar content and timing that does not damage sleep. Marketing, can colour and a longer ingredient list do not establish superiority.
Should fighters use caffeine before sparring or competition?
Never trial a new product or dose before hard sparring or a bout. If a familiar intake makes you alert without anxiety, stomach upset or rushed technique, it may suit some healthy adults—but the lowest effective amount is more useful than maximum stimulation.
Coach’s view: boxing rewards controlled aggression. If caffeine makes you tense, impatient or too eager to throw, the physical boost may be cancelled out by poorer decisions and wasted movement.
Beyond combat sports
Are Energy Drinks Good Before a Workout or the Gym?
A caffeinated energy drink can improve some exercise outcomes for some adults, but it is not necessary for a productive workout. The likely value depends on the training goal, session length, caffeine dose, time of day, recent food and personal tolerance.
Strength training
Caffeine may support focus and some strength or power outcomes, but an energy drink cannot replace progressive programming, adequate food or recovery.
Intervals and conditioning
A familiar caffeine dose may make demanding repetitions feel more manageable, although too much can worsen pacing, breathing control or nausea.
Cardio and endurance
Caffeine has evidence for endurance performance, but longer sessions may also require water, carbohydrate and electrolytes—needs an energy drink may not meet well.
A normal one-hour workout
When you are rested, fed and hydrated, water is often sufficient. A stimulant should solve a specific problem rather than become a requirement for every session.
Benefits, risks and individual response
Are Energy Drinks Bad for You? Risks, Side Effects and Who Should Avoid Them
An occasional, moderate intake is unlikely to harm most healthy adults, but energy drinks are not risk-free. Side effects become more likely as the caffeine dose rises, when several stimulant sources are combined, or when the person has a relevant medical condition or high caffeine sensitivity.
Can energy drinks cause jitters, anxiety or palpitations?
They can. Shaky hands, excessive arousal, anxiety or a racing-heart sensation are more likely with higher doses and can undermine relaxed movement, breathing and accuracy.
How do energy drinks affect sleep and recovery?
A late energy drink can make recovery worse by delaying or reducing sleep—even if the evening session feels better.
Can energy drinks upset your stomach?
Carbonation, sweetness, acidity and a large volume of fluid can be uncomfortable during skipping, body shots or hard intervals.
What is stimulant stacking?
Coffee, pre-workout and energy drinks can quietly turn a moderate intake into an excessive one.
Are energy drinks safe in moderation?
For most healthy adults, an occasional energy drink within recognised caffeine guidance is unlikely to create a safety concern. “Moderate” still depends on the entire can, every other caffeine source, timing and personal response.
Who should avoid energy drinks?
Children, people who are pregnant or breastfeeding, and anyone with a heart condition, high blood pressure, significant anxiety, caffeine sensitivity or a possible medication interaction should follow label warnings and obtain qualified healthcare advice.
Should children and teenagers drink energy drinks?
High-caffeine drinks are not a shortcut for poor sleep or inadequate food. The UK Government has confirmed an under-16 sales ban in England for drinks above 150 mg of caffeine per litre. Parents and coaches should prioritise meals, water, sleep and an age-appropriate training load.
Correcting a common myth
Do Energy Drinks Dehydrate You During Exercise?
Moderate caffeine intake does not automatically dehydrate a healthy adult during exercise. Reviews cited by the International Society of Sports Nutrition report that recommended caffeine doses do not significantly disrupt hydration or temperature regulation, including exercise in the heat.
That does not make an energy drink a complete hydration plan. Boxing gyms can be hot, sweat rates vary, and a caffeinated drink may be too small, too sweet or too carbonated to replace the fluid you need. Water should still be available; longer, hotter or unusually high-volume sessions may justify planned electrolytes and carbohydrate.
Simple hydration check
Start the session normally hydrated rather than trying to catch up at the door.
Bring water and take sensible drinks between rounds.
Use thirst, urine colour, session length, heat and your usual sweat loss as practical clues.
Do not confuse a caffeinated buzz with adequate fuel or fluid.
Choose for the job
Energy Drinks vs Coffee and Sports Drinks: Which Is Better?
The best drink depends on whether you need stimulation, hydration, carbohydrate—or simply water. Coffee and energy drinks can both provide caffeine, while sports drinks are designed around fluid, carbohydrate and electrolytes rather than alertness.
Coffee vs energy drinks
Both can supply caffeine. Plain coffee usually has fewer added ingredients and no sugar unless you add it, but its caffeine dose can vary by bean, serving and preparation.
Energy drinks vs sports drinks
Energy drinks are stimulant products. Sports drinks are intended to help supply fluid, carbohydrate and electrolytes during longer or demanding exercise. They are not interchangeable.
Sugar-free vs sugared energy drinks
Sugar-free removes the added sugar but not the caffeine. A sugared version provides quick carbohydrate, although many normal gym and boxing sessions do not require it.
Drink
Best fit
Watch for
Water
Most normal technical, pad and fitness sessions
It provides no carbohydrate when you genuinely need fuel
Small coffee
A familiar caffeine option with few extras
Caffeine content varies; it may still affect sleep or your stomach
Sugar-free energy drink
A labelled caffeine dose without added sugar
It is still a stimulant and does not provide training fuel
Sugared energy drink
Caffeine plus quick carbohydrate when both are planned
Added sugar, carbonation and a dose that may be unnecessary
Sports/electrolyte drink
Long, hot or high-volume sessions with meaningful sweat loss
It is not a stimulant; many ordinary sessions only need water
Yerba Mate vs Energy Drinks: Is It a Better Alternative?
Yerba mate can be a simpler alternative, but it is not automatically safer, caffeine-free or better for exercise. It is a South American plant drink that naturally contains caffeine. The amount depends on how it is brewed, the serving size and whether you are drinking traditional mate or a bottled yerba-mate product.
Some people describe the effect as smoother than coffee or an energy drink, but that personal experience is not a guarantee of fewer jitters or no energy crash. A controlled study comparing yerba-mate and conventional energy shots did not find an improvement in the tested five-kilometre running performance. The sensible comparison is still total caffeine, added sugar, serving size, tolerance and timing.
Traditional yerba mate
Brewed from leaves and water. Caffeine varies with preparation, quantity, repeated infusions and cup size.
Yerba-mate energy drinks
A packaged product may also contain added caffeine, sugar, sweeteners or other ingredients. “Natural” on the can does not tell you the dose.
For boxing or workouts
Treat it as another caffeine source: test it in training, count the dose and avoid assuming it can replace food, water or sleep.
A practical decision
Should You Drink an Energy Drink Before Boxing or Exercise?
It may be reasonable when…
You are a healthy adult who already tolerates caffeine
You know the full caffeine dose
The session is early enough not to damage sleep
You have tested the same product in ordinary training
Skip it when…
You already feel anxious, shaky or unwell
It is a late session and sleep is the bigger priority
You have already used other caffeine products
It is your first trial and the session involves hard sparring
The lowest-effective-dose principle
Sports studies often test 3–6 mg of caffeine per kilogram of body mass, but that is not permission to copy a laboratory protocol. EFSA’s general guidance for healthy adults says a single dose up to 200 mg does not raise safety concerns. Those are different ideas: a safety boundary is not a target, and a research range is not personalised advice.
Hello, I’m Paul
About Paul Carroll, Boxing Trainer London
I am a former British University Heavyweight Boxing Champion and former Great Britain international decathlete. I hold a BSc (Hons) in Sport Science, am an Advanced Personal Trainer and have spent more than 25 years coaching boxing, fitness and performance.
I have worked with complete beginners, busy professionals, white-collar competitors and public figures across London. My work with Geri Halliwell-Horner is one example of the same structured, encouraging approach I bring to every client: sound technique, progressive conditioning and advice people can actually use.
For this guide, I have combined first-hand coaching experience with published sport-science and public-health evidence. The aim is not to sell a supplement or frighten people away from caffeine; it is to help boxers, gym-goers and everyday readers understand the dose, benefits, limitations and risks before deciding what is right for them.
Women’s Health interviewed Paul about training Geri Horner, published his advice on strength, balance and energy after 50, and included three core workouts from his coaching.
HELLO! covered Geri Halliwell-Horner’s boxing workout, with Paul appearing as her trainer in the session—a look at the focused pad work behind her fitness routine.
“One session with Paul was worth ten training in that altar of self-deception — the gym.”
Duncan Craig, writing in the Daily Express after training with Paul in Hyde Park.
Frequently asked questions
Energy Drinks and Exercise FAQs
Are energy drinks good for boxing?
They can help some healthy adults feel more alert and may support aspects of exercise performance, mainly because of caffeine. They are not essential, and too much can cause jitters, stomach upset, anxiety or poor sleep. Know the dose and test your response in normal training.
Can an energy drink improve punching speed or stamina?
Caffeine can improve alertness, perceived effort and some high-intensity or endurance outcomes, but it does not guarantee faster punches or better boxing. Technique, pacing, fitness, sleep and nutrition still have a larger role.
How much caffeine is in an energy drink?
It varies by product and can size. EFSA uses about 80 mg for a typical 250 ml can as a reference, while a 500 ml can labelled 32 mg per 100 ml contains 160 mg. Always read the label and include caffeine from coffee, tea, pre-workout and gels.
Are energy drinks bad for you?
An occasional moderate intake is unlikely to harm most healthy adults, but energy drinks are not risk-free. Higher or repeated caffeine doses can increase the likelihood of jitters, anxiety, stomach upset, poor sleep and a racing-heart sensation, especially in sensitive people.
Is yerba mate better than an energy drink?
Yerba mate can be a simpler caffeine source, but it is not automatically safer or better for exercise. Caffeine varies with preparation and packaged yerba-mate drinks may contain sugar or other ingredients. Compare the total dose, serving size, timing and your response.
Is coffee healthier than an energy drink?
Plain coffee normally contains fewer added ingredients and no sugar unless you add it, but its caffeine content can vary substantially. Either drink can cause side effects if the dose is too high or the timing damages sleep.
What is the difference between an energy drink and a sports drink?
An energy drink is primarily marketed for stimulation and usually contains caffeine. A sports drink is designed around fluid, carbohydrate and electrolytes for longer or demanding exercise. They serve different purposes and are not interchangeable.
Do energy drinks dehydrate you during exercise?
Moderate caffeine does not automatically dehydrate a healthy adult during exercise. You still need a sensible hydration plan because an energy drink may not provide enough fluid for a hot or demanding boxing session.
Is it safe to drink an energy drink before sparring?
Do not try a new product or dose before hard sparring. If caffeine makes you anxious, shaky, nauseous or over-stimulated, avoid it. A familiar, well-tolerated intake may be acceptable for some healthy adults, but calm judgement and control come first.
Are sugar-free energy drinks healthier?
They remove the added sugar but still contain caffeine and may still affect sleep, anxiety or your stomach. Whether that is better depends on whether you need carbohydrate as well as stimulation; many ordinary sessions need neither.
Should children or teenagers drink energy drinks?
High-caffeine drinks are not a suitable shortcut for poor sleep or inadequate food. Follow UK warning labels and age-of-sale rules. Parents and coaches should prioritise age-appropriate training, meals, water and recovery.
What should I drink before boxing training?
Water is enough for many normal sessions. A small familiar coffee can provide caffeine with fewer ingredients. Longer, hotter or high-volume sessions may need planned electrolytes and carbohydrate. Choose according to the session and your personal tolerance.
This article translates general caffeine and sport-nutrition research into practical exercise and boxing guidance. It does not replace medical or dietetic advice.
Updated 28 August 2026 · Evidence-led exercise and boxing advice
Are Energy Drinks Good for You? Exercise, Performance & Safety
Energy drinks can sharpen alertness and support performance for some adults, but the useful ingredient is usually caffeine—not the can. The wrong dose can also bring jitters, poor sleep, stomach upset and rushed technique.
BSc (Hons) Sport Science
Google 5.0 · 54 reviews
Trustpilot 4.5 · 15 reviews
Jump to FAQs
Typical reference
80 mg caffeine
About the amount EFSA lists for a standard 250 ml energy drink.
Healthy adults
200 mg single dose
EFSA’s general no-safety-concern level—not a performance target.
Research range
3–6 mg/kg
Often studied in sport, but not a blanket recommendation for every boxer.
Most important rule
Test in training
Never experiment with a new drink before hard sparring or competition.
The short version
Are Energy Drinks Good for You? The Quick Answer
Sometimes—but they are not essential. Caffeine may improve alertness, concentration and some aspects of high-intensity or endurance performance. Whether that helps depends on the dose, timing, activity and your individual response.
The trade-off is real. Too much can cause jitters, anxiety, stomach upset, a racing sensation or poor sleep. For boxing and other skill-based exercise, being more stimulated is not always being more skilful: calm decisions, rhythm and accuracy matter. If you use caffeine, know the dose, count every source, start low and test it in an ordinary session—not before hard sparring, competition or an important workout.
This guide is general education, not medical advice. If you have a heart condition, high blood pressure, anxiety or panic symptoms, are pregnant or breastfeeding, take medication, or are unusually sensitive to caffeine, seek personalised advice from a qualified healthcare professional.
What is actually in the can?
How Energy Drinks Work: Caffeine, Sugar, Taurine and Guarana
Most of the noticeable effect comes from caffeine, with sugar supplying carbohydrate in sugared versions. Taurine, guarana, B vitamins and other additions may make the label look more advanced, but their presence does not prove that the drink will improve performance.
Caffeine
A central-nervous-system stimulant that can reduce sleepiness and make effort feel more manageable. It is the ingredient with the clearest evidence for alertness and exercise performance.
Sugar or sweeteners
Sugared versions provide carbohydrate as well as caffeine. That may be useful in some long or demanding sessions, but it is often unnecessary for a normal one-hour session when you have eaten properly.
Taurine
A naturally occurring amino-sulfonic compound included in many products. Its presence does not mean the drink will outperform a known dose of caffeine on its own.
B vitamins and blends
B vitamins support normal energy metabolism, but adding more does not create instant energy. Guarana is another caffeine source, so it must be counted in the total stimulant dose.
Know what you are taking
How Much Caffeine Is in an Energy Drink—and How Much Is Too Much?
A standard 250 ml energy drink is often around 80 mg, but larger or stronger products can contain 160–200 mg in one container. The only reliable approach is to read the label, calculate the whole can and count caffeine from every other source that day.
Count caffeine from every source
Coffee, tea, cola, pre-workout, energy gels, caffeine gum and another can all contribute to the same total. Individual tolerance does not prove that a high intake is necessary, and a familiar dose can still damage sleep when taken late.
Where caffeine may help
Are Energy Drinks Good for Boxing, MMA and Combat Sports?
They may support alertness, perceived effort and some aspects of repeated high-intensity work, mainly because of caffeine. Combat sports also depend on calm judgement, timing, accuracy and efficient movement, so feeling more stimulated does not automatically mean performing better.
Can caffeine improve reaction time, stamina or power?
What an energy drink cannot do
Are any energy drinks best for combat sports athletes?
There is no universally best brand for boxing, MMA or another combat sport. A useful choice would need a known caffeine dose, ingredients you tolerate, an appropriate sugar content and timing that does not damage sleep. Marketing, can colour and a longer ingredient list do not establish superiority.
Should fighters use caffeine before sparring or competition?
Never trial a new product or dose before hard sparring or a bout. If a familiar intake makes you alert without anxiety, stomach upset or rushed technique, it may suit some healthy adults—but the lowest effective amount is more useful than maximum stimulation.
Coach’s view: boxing rewards controlled aggression. If caffeine makes you tense, impatient or too eager to throw, the physical boost may be cancelled out by poorer decisions and wasted movement.
Beyond combat sports
Are Energy Drinks Good Before a Workout or the Gym?
A caffeinated energy drink can improve some exercise outcomes for some adults, but it is not necessary for a productive workout. The likely value depends on the training goal, session length, caffeine dose, time of day, recent food and personal tolerance.
Strength training
Caffeine may support focus and some strength or power outcomes, but an energy drink cannot replace progressive programming, adequate food or recovery.
Intervals and conditioning
A familiar caffeine dose may make demanding repetitions feel more manageable, although too much can worsen pacing, breathing control or nausea.
Cardio and endurance
Caffeine has evidence for endurance performance, but longer sessions may also require water, carbohydrate and electrolytes—needs an energy drink may not meet well.
A normal one-hour workout
When you are rested, fed and hydrated, water is often sufficient. A stimulant should solve a specific problem rather than become a requirement for every session.
Benefits, risks and individual response
Are Energy Drinks Bad for You? Risks, Side Effects and Who Should Avoid Them
An occasional, moderate intake is unlikely to harm most healthy adults, but energy drinks are not risk-free. Side effects become more likely as the caffeine dose rises, when several stimulant sources are combined, or when the person has a relevant medical condition or high caffeine sensitivity.
Can energy drinks cause jitters, anxiety or palpitations?
They can. Shaky hands, excessive arousal, anxiety or a racing-heart sensation are more likely with higher doses and can undermine relaxed movement, breathing and accuracy.
How do energy drinks affect sleep and recovery?
A late energy drink can make recovery worse by delaying or reducing sleep—even if the evening session feels better.
Can energy drinks upset your stomach?
Carbonation, sweetness, acidity and a large volume of fluid can be uncomfortable during skipping, body shots or hard intervals.
What is stimulant stacking?
Coffee, pre-workout and energy drinks can quietly turn a moderate intake into an excessive one.
Are energy drinks safe in moderation?
For most healthy adults, an occasional energy drink within recognised caffeine guidance is unlikely to create a safety concern. “Moderate” still depends on the entire can, every other caffeine source, timing and personal response.
Who should avoid energy drinks?
Children, people who are pregnant or breastfeeding, and anyone with a heart condition, high blood pressure, significant anxiety, caffeine sensitivity or a possible medication interaction should follow label warnings and obtain qualified healthcare advice.
Should children and teenagers drink energy drinks?
High-caffeine drinks are not a shortcut for poor sleep or inadequate food. The UK Government has confirmed an under-16 sales ban in England for drinks above 150 mg of caffeine per litre. Parents and coaches should prioritise meals, water, sleep and an age-appropriate training load.
Correcting a common myth
Do Energy Drinks Dehydrate You During Exercise?
Moderate caffeine intake does not automatically dehydrate a healthy adult during exercise. Reviews cited by the International Society of Sports Nutrition report that recommended caffeine doses do not significantly disrupt hydration or temperature regulation, including exercise in the heat.
That does not make an energy drink a complete hydration plan. Boxing gyms can be hot, sweat rates vary, and a caffeinated drink may be too small, too sweet or too carbonated to replace the fluid you need. Water should still be available; longer, hotter or unusually high-volume sessions may justify planned electrolytes and carbohydrate.
Simple hydration check
Choose for the job
Energy Drinks vs Coffee and Sports Drinks: Which Is Better?
The best drink depends on whether you need stimulation, hydration, carbohydrate—or simply water. Coffee and energy drinks can both provide caffeine, while sports drinks are designed around fluid, carbohydrate and electrolytes rather than alertness.
Coffee vs energy drinks
Both can supply caffeine. Plain coffee usually has fewer added ingredients and no sugar unless you add it, but its caffeine dose can vary by bean, serving and preparation.
Energy drinks vs sports drinks
Energy drinks are stimulant products. Sports drinks are intended to help supply fluid, carbohydrate and electrolytes during longer or demanding exercise. They are not interchangeable.
Sugar-free vs sugared energy drinks
Sugar-free removes the added sugar but not the caffeine. A sugared version provides quick carbohydrate, although many normal gym and boxing sessions do not require it.
For the bigger picture—meals, carbohydrates, protein and recovery—read Nutrition for Boxers: What to Eat Before and After Training.
A natural caffeine source
Yerba Mate vs Energy Drinks: Is It a Better Alternative?
Yerba mate can be a simpler alternative, but it is not automatically safer, caffeine-free or better for exercise. It is a South American plant drink that naturally contains caffeine. The amount depends on how it is brewed, the serving size and whether you are drinking traditional mate or a bottled yerba-mate product.
Some people describe the effect as smoother than coffee or an energy drink, but that personal experience is not a guarantee of fewer jitters or no energy crash. A controlled study comparing yerba-mate and conventional energy shots did not find an improvement in the tested five-kilometre running performance. The sensible comparison is still total caffeine, added sugar, serving size, tolerance and timing.
Traditional yerba mate
Brewed from leaves and water. Caffeine varies with preparation, quantity, repeated infusions and cup size.
Yerba-mate energy drinks
A packaged product may also contain added caffeine, sugar, sweeteners or other ingredients. “Natural” on the can does not tell you the dose.
For boxing or workouts
Treat it as another caffeine source: test it in training, count the dose and avoid assuming it can replace food, water or sleep.
A practical decision
Should You Drink an Energy Drink Before Boxing or Exercise?
It may be reasonable when…
Skip it when…
The lowest-effective-dose principle
Sports studies often test 3–6 mg of caffeine per kilogram of body mass, but that is not permission to copy a laboratory protocol. EFSA’s general guidance for healthy adults says a single dose up to 200 mg does not raise safety concerns. Those are different ideas: a safety boundary is not a target, and a research range is not personalised advice.
Hello, I’m Paul
About Paul Carroll, Boxing Trainer London
I am a former British University Heavyweight Boxing Champion and former Great Britain international decathlete. I hold a BSc (Hons) in Sport Science, am an Advanced Personal Trainer and have spent more than 25 years coaching boxing, fitness and performance.
I have worked with complete beginners, busy professionals, white-collar competitors and public figures across London. My work with Geri Halliwell-Horner is one example of the same structured, encouraging approach I bring to every client: sound technique, progressive conditioning and advice people can actually use.
For this guide, I have combined first-hand coaching experience with published sport-science and public-health evidence. The aim is not to sell a supplement or frighten people away from caffeine; it is to help boxers, gym-goers and everyday readers understand the dose, benefits, limitations and risks before deciding what is right for them.
Client success stories
National media coverage
Women’s Health UK · 2026
Expert Advice and Core Workouts
Women’s Health interviewed Paul about training Geri Horner, published his advice on strength, balance and energy after 50, and included three core workouts from his coaching.
Read the Women’s Health feature →
HELLO! Magazine · 2023
Geri’s Boxing Training
HELLO! covered Geri Halliwell-Horner’s boxing workout, with Paul appearing as her trainer in the session—a look at the focused pad work behind her fitness routine.
Read the HELLO! feature →
Daily Express · Boxing Day feature
A Hyde Park Training Session
Duncan Craig, writing in the Daily Express after training with Paul in Hyde Park.
Frequently asked questions
Energy Drinks and Exercise FAQs
Are energy drinks good for boxing?
They can help some healthy adults feel more alert and may support aspects of exercise performance, mainly because of caffeine. They are not essential, and too much can cause jitters, stomach upset, anxiety or poor sleep. Know the dose and test your response in normal training.
Can an energy drink improve punching speed or stamina?
Caffeine can improve alertness, perceived effort and some high-intensity or endurance outcomes, but it does not guarantee faster punches or better boxing. Technique, pacing, fitness, sleep and nutrition still have a larger role.
How much caffeine is in an energy drink?
It varies by product and can size. EFSA uses about 80 mg for a typical 250 ml can as a reference, while a 500 ml can labelled 32 mg per 100 ml contains 160 mg. Always read the label and include caffeine from coffee, tea, pre-workout and gels.
Are energy drinks bad for you?
An occasional moderate intake is unlikely to harm most healthy adults, but energy drinks are not risk-free. Higher or repeated caffeine doses can increase the likelihood of jitters, anxiety, stomach upset, poor sleep and a racing-heart sensation, especially in sensitive people.
Is yerba mate better than an energy drink?
Yerba mate can be a simpler caffeine source, but it is not automatically safer or better for exercise. Caffeine varies with preparation and packaged yerba-mate drinks may contain sugar or other ingredients. Compare the total dose, serving size, timing and your response.
Is coffee healthier than an energy drink?
Plain coffee normally contains fewer added ingredients and no sugar unless you add it, but its caffeine content can vary substantially. Either drink can cause side effects if the dose is too high or the timing damages sleep.
What is the difference between an energy drink and a sports drink?
An energy drink is primarily marketed for stimulation and usually contains caffeine. A sports drink is designed around fluid, carbohydrate and electrolytes for longer or demanding exercise. They serve different purposes and are not interchangeable.
Do energy drinks dehydrate you during exercise?
Moderate caffeine does not automatically dehydrate a healthy adult during exercise. You still need a sensible hydration plan because an energy drink may not provide enough fluid for a hot or demanding boxing session.
Is it safe to drink an energy drink before sparring?
Do not try a new product or dose before hard sparring. If caffeine makes you anxious, shaky, nauseous or over-stimulated, avoid it. A familiar, well-tolerated intake may be acceptable for some healthy adults, but calm judgement and control come first.
Are sugar-free energy drinks healthier?
They remove the added sugar but still contain caffeine and may still affect sleep, anxiety or your stomach. Whether that is better depends on whether you need carbohydrate as well as stimulation; many ordinary sessions need neither.
Should children or teenagers drink energy drinks?
High-caffeine drinks are not a suitable shortcut for poor sleep or inadequate food. Follow UK warning labels and age-of-sale rules. Parents and coaches should prioritise age-appropriate training, meals, water and recovery.
What should I drink before boxing training?
Water is enough for many normal sessions. A small familiar coffee can provide caffeine with fewer ingredients. Longer, hotter or high-volume sessions may need planned electrolytes and carbohydrate. Choose according to the session and your personal tolerance.
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Evidence and further reading
Research Used in This Guide
This article translates general caffeine and sport-nutrition research into practical exercise and boxing guidance. It does not replace medical or dietetic advice.
Continue learning
Related Boxing & Fitness Guides
Essential Boxing Training TipsImprove technique, fitness and recovery.
Alcohol and ExerciseHow alcohol affects training and recovery.
Boxing for BeginnersWhat to expect from your first sessions.
London Training PackagesOne-to-one boxing coaching across London.
Online Personal TrainingRemote boxing, conditioning and accountability.
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