I've been doing pull ups for 6 years now. I can only do 5 on a good day... I got up to 6 or 7 a few years ago but then got elbow tendonitis and THEN badly sprained my thumb. So I laid off them for awhile. A couple years ago, I started doing them but just sets anyone from 2-5 reps... I have a hard time with them even though I love them. Now 2 weeks ago, I started making it a point to do pull ups/chins in any rep scheme for 20 mins, plus bodyweight squats... (before I move on to my main workout). Its been great, but I'm taking it slow because i'm afraid of tennis elbow. Boy, am I sore though, its like when I FIRST started exercising. I'm planning on enlisting in the Marines (gotta do it soon as i'm almost 26).. Would have done it when I was younger but a sick mother and family company has a way of changing plans.