There has been a lot of buzz about the post workout benefits of chocolate milk. Chocolate milk provides whey protein, carbohydrates, water, and other nutrients and minerals. Not bad! It’s inexpensive, easy to mix up, and tastes good. Plus, most young athletes will love it when you suggest that they enjoy a glass of chocolate milk.
For further reading, here is a detailed article on pre and post workout nutrition.
For another healthy and kid friendly drink, see Eat: Alien Plant Food.