Minimize Dehydration

Dehydration can occur in virtually every physical activity scenario. It doesn't have to be hot. You don't have to have visible perspiration.
 
Dehydration results when athletes fail to adequately replace fluid lost through sweating. Since dehydration that exceeds 2 percent body weight loss harms exercise performance, athletes are advised to begin exercise well hydrated, minimize dehydration during exercise and replace fluid losses after exercise.