bert goes to the gym and works out strenuously for about 45 minutes. after his exercise session he weighs himself and notices that he has lost a pound. how much fluid should he drink to rehydrate his body? bert goes to the gym and works out strenuously for about 45 minutes. after his exercise session he weighs himself and notices that he has lost a pound. how much fluid should he drink to rehydrate his body? 3 cups 4 cups 1 cup 2 cups