Remember, when you exercise, your body will lose water quickly because of sweating. These liquids must be replenished in time, otherwise your body will dehydrate and feel thirsty as time goes by. So, don't forget to hydrate your body from beginning to end. Generally speaking, the human body needs 8 breasts of water every day, and needs more when it starts to exercise. In addition, drinking plenty of water helps to reduce hunger and appetite.