Chocolate Milk?!!? Maybe I'm missing something here but that sounds like a horrible thing to drink post workout. First off, the protein in milk (casein) digests very slowly so when you get done with a ride and your body is screaming for protein to repair damaged muscle tissue the last thing you want to do is eat/drink a protein that takes longer to digest. Whey protein is far superior post-workout because it is processed by the body much quicker. Second, chocolate milk obviously contains sugar which is a high GI (Glycemic Index) carbohydrate. It digests fast and the energy it contains is used fast. When you consume high GI carbs after a workout it causes your insulin levels to spike and then rapidly drop which is not good for muscle recovery. After working out you should consume low GI carbs like oatmeal, brown rice, whole grains. Low GI carbs create a sustained increase of insulin in the blood stream which allows for quicker recovery.