Staying hydrated when exercising is very important for everyone. The amount of exercise and how much sweating goes on are the biggest things to think about when deciding what your child should drink and the amount of fluid he should have.
Exercise lasting less than an hour in a cool environment where there is little sweating calls for plain water. The longer your child exercises and the more he sweats, the greater the chance he will need a sports drink.
Be sure to check the label to see how much sugar (carbohydrates), caffeine, vitamins and electrolytes the beverage contains. Children do not need drinks with caffeine.
Nor does your child need vitamin water after exercising. All vitamins are best obtained from fruits and vegetables. Many vitamin waters are flavored with alternative sweeteners, and kids don’t need added sweeteners or alternative sweeteners in their drinks.
Water is the best fluid replacement in most instances for most children. If adding a flavor will help your child to drink water, then squeeze in the juice of a lemon, a lime or an orange (no seeds!), which will add flavor without adding calories or salt.