I wouldn't say overtraining was bs, considering the build of a military versus bodybuilders. Most soldiers sport the lean proportionate look not a lot of mass, and bodybuilding is based on mass. You can break the muscle down far enough so that it doesn't grow, which is what I think is meant by overtraining. Bodybuilders can't keep thier mass and do PT, as soldiers can't do PT and grow the mass of a BB.