What I am about to tell you is going make you hit your head and say Dah! Before I get to that though I want to express my frustration with every level of professional to the parent who are saying to themselves "I know what works, I've been training my whole life.". Not all of you have this attitude i know, but others of you need to accept some coaching. Anyone can read a magazine or watch a video or just do the workout your coach did with you 20 maybe 30 years ago ( like we haven't had any scientific advances in exercise programming since then). Maybe you do know the "What" but what about the "How" and "Why" and especially "When". Today I will try to answer simply the "How" your body responds to different exercises so you can start implementing a better more diverse program.