I have some questions on pull-ups, however, I wanted to search for them first to keep from reposting, there are 1951 or so articles, mostly journals and things, so I am just going to ask. I just bought a golds gym pull up bar, the kind you screw into your doorway. It's ok, a little harder than a regular bar, but that's cool, another challenge. My question is is it ok to do them alot, or am I messing up my muscles rebuilding themselves and hurting myself? I would like to do them everytime I just feel like it, not really a routine, just some added fun to the day, is that ok? I'm not really on any specific workout routine anyway, I just hit the gym in the mornings and rest on the weekends. (Except lately I've been crapping out on myself, but I'm back now). Also, I always hear different things about pull-ups, and I was wondering what exactly gets worked out? I heard everything from just arms to every muscle in the body. I thought I would ask the experts. Thanks a lot.