An hour's run or gym class uses enough bodily fluid to cause dehydration if you don't drink during your workout. Here's how to calculate how much water you need to drink.

How to work out how much you need to drink after exercising

Strong Women

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Why drinking during exercise is better than rehydrating after working out

How to workout how much fluid you’ve lost during exercise

An hour’s workout is long enough to become dehydrated

We never really manage to replace lost fluid – so it’s better to reduce how much we lose in the first place.

Here’s how much water you need to drink after exercising – and why we should aim to drink throughout our workouts