9th September 2021

How does water improve exercise?

Drinking Water During Exercise – A Complete Guide

This guide covers the benefits of drinking water during exercise, how much water to consume before, during and after a workout, and which drinks to avoid while training. It is intended to help gym-goers optimise their hydration for better performance and results.

Why Hydration Matters During Exercise

Water is essential for healthy bodily function. Insufficient hydration during exercise can result in:

  • Increased heart rate and body temperature, particularly if fluid levels fall below normal
  • Slower bodily functions, leading to digestive discomfort
  • Increased fatigue, which can cause early termination of a workout
  • Reduced motor control and concentration
  • Decreased gym performance and slower overall progress

Is It Safe to Drink Water During a Workout?

Not only is it safe — it is strongly recommended. Water is the optimal choice for staying hydrated during exercise. Sports drinks can also be used but should be consumed with awareness of their sugar and calorie content.

Drinks to Avoid During Exercise

The following should be avoided during workouts:

  • Soft drinks
  • Fruit juice
  • Caffeinated drinks

How Much Water to Drink Before, During and After Exercise

The following guidelines are based on recommendations from the American Council on Exercise:

TimingRecommended Amount
2 to 3 hours before exercise0.5 to 0.9 litres
20 to 30 minutes before exerciseApproximately 0.2 litres
Every 10 to 20 minutes during exercise0.2 to 0.3 litres
After exercise (over 2 to 6 hours)1.5 times the fluid lost through sweat

In total, most people will consume approximately one to one and a half litres before and during a typical workout session.

Important Considerations

These are general guidelines. Individual hydration needs vary based on body weight, gender, and health conditions. Anyone with a relevant health condition should consult a doctor before following specific hydration targets.

How Much Water to Drink After Exercise

Hydration should continue after a workout as the body continues to lose fluid through sweat and normal bodily functions. As a general guide, aim to drink at least 0.25 litres immediately after exercise, then continue to replace fluids over the following two to six hours, targeting approximately one and a half times the estimated fluid lost during the session.

Does Drinking Water Cause Weight Gain?

No. Drinking water does not cause weight gain. Research suggests the opposite — drinking water can increase calorie burn. Studies indicate that consuming 0.5 litres of water may help burn an additional 23 calories.

Key Takeaways

  • Dehydration during exercise negatively affects heart rate, concentration, motor control and performance
  • Water is the best hydration choice during a workout
  • Soft drinks, juice and caffeine should be avoided during training
  • Adults should aim to consume one to one and a half litres of water before and during exercise
  • Post-workout hydration is equally important and should continue for two to six hours after training
  • Drinking water can support calorie burning rather than causing weight gain

Related Topics

  • Gym nutrition and hydration
  • Pre-workout preparation
  • How to improve gym performance
  • Weight loss tips for gym-goers
  • Benefits of drinking water for fitness


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