Finally, the Caveman mod is available for your life! Unfortunately there isn't a full version available - you still have to play in the preexisting world , so there's a bit of improvisation when it comes to modern devices - but with just a bit of imagination and a few basic resources, you can transform your mind and body into a true inhabitant of the Stone Age.
Unfortunately, this mod is freakin' HUGE, so you'll have to install it in several parts. You can get it here:
Seriously - this guy is all about hacking your body for better performance through various lifestyle changes. You don't have to go the whole caveman hog - I realize that the squatting mod may be a little extreme for some - but there are plenty of simple, practical hacks to improve your overall quality of life (and let some of that old-fashioned caveman out).