The P90X Chin-Up Bar is another piece of exercise equipment that I just purchased. Due to the fact that pull-ups play a big part in the P90X workout routines, this is a must-own unless you have an exercise tower already.
The P90X Chin-Up Bar is pretty cool actually. It basically fits into a doorway and allows you to perform pull-ups without bulky expensive equipment.
Another neat thing about it is the fact that there is no drilling or permanent installation required — it simply fits into your doorway and is secured when you put weight on it.
I haven’t tried to do any pull-ups with it yet, but from what I’ve heard it’s not supposed to damage the door frame at all. It will fit any doorframe up to 32″.