Most people look at Dave and say, "I wish I could look like that, but there's no way." Now if you're taking about his mustache, you're on your own. But if you're looking to get a body that is more "Dave-like" (his words, not ours) below is a simple workout routine to help get you looking good.
Also, if you're going to workout like Dave, you need to recover like him as well. Make sure you drink Muscle Milk at least 30 minutes after working out to give your muscles the love they deserve.