MILK's lactose gives me the runs, and i would be hurting and cramping while lifting, try isopure...lol...taste like crap but i hear it is pretty good. Arnold contradicted himself always saying he drank milk, then he didnt, so only he knows what is best
but if you look at whole milks contributes, it is a good source of calories, yet quite easy to have a lot of it, assuming you aren't lactose intolerant, and besides, milk is natural right?