Protein is the greatest need your body has to rebuild muscles broken down in a workout. Have you ever tried to drink protein powder mix though? It's awful. I've had a few over the years and simply concluded that it wasn't worth it. Then a friend turned me on to Muscle Milk. When he opened the container and I didn't immediately flinch from that typical protein smell, I immediately thought it just couldn't be protein. Instead of using water, I got it in a nice glass full of cold milk.
Delicious. No, I mean ACTUALLY good. This stuff tastes so great, that I would drink it voluntarily even when I hadn't worked out! I was hooked, and still am. I buy the huge containers of it and drink it after every workout.
If you want to perform well at your next race, you need to put in the hard workouts. If you want to put in more than 1 hard workout every 10 days, then you need to recover well. Muscle Milk will help you do just that.