Drinking water after exercise allows the body to sleep. Drinking water after exercise helps to replace lost fluids. Drinking water before exercise helps increase the heart rate. Drinking water before exercise prevents the body from sweating.
I gave my students this multiple choice question: Tony always drinks water before and after his long bike rides. Why does his body need water when he exercises?

Only one answer is correct among these 4 choices:
- Drinking water after exercise allows the body to sleep.
- Drinking water after exercise helps to replace lost fluids.
- Drinking water before exercise helps increase the heart rate.
- Drinking water before exercise prevents the body from sweating.

Could you tell me which one is correct?

Drinking water after exercise helps to replace lost fluids.