Milk... does a body good. And for some athletes, chocolate milk can do your body even better.
Studies suggest that for some athletes, after an intensive cardio workout, (cycling, swimming, running) chocolate milk can be better for your body's recovery than gatorade or the like. It has just the right mix of sugars and proteins to replenish sore muscles.
This is not for the "I just worked out for 15 minutes" crowd. But if you are dead beat after a 45 min or 60 workout, give some low fat chocolate milk a try. Say 6 oz. or 4 oz if you are trying to lose weight.
I've been doing this pretty religiously on anything 5 miles or higher. So far, I am able to run back to back days much easier, and my sore limping time has decreased. Give it a shot.
Here's one of my sources for the article.