Cavemen?

As I walked over to the barbell rack at Deadman to grab the necessary weights for my 21's I started spacing off in my head. Every day so many SMU students make their way to the gym to run or swim or lift weights to stay in prime, sexy shape, but when did the concept of using tools to stay in shape arise. I'm sure the neanderthals weren't too worried about lifting rocks and trees to tone their shoulders and biceps. Obviously they got stronger just trying to survive in a world where, let's be honest, they weren't exactly the top of the food chain. I don't know whether the cavemen and women were in shape or not nor do I think it mattered because they were always active simply trying to exist, but at some point our activity diminished so that people no longer had to stay in good health and shape to live. Now you see people going to the gym everyday to tone their bodies and trim fat, at some point someone must have realized, "hmmm when I exert myself, my muscles hurt all over" and their reaction must have been to refrain from whatever it was that caused their body physical pain. Eventually someone learned that by stressing and shocking your body that it will result it it growing and becoming stronger. I guess its like the first time someone tried a chilli pepper, it burned their eyes nose and mouth but eventually people learned of its flavor enhancing ability.