I do a lot of bodyweight training to supplement my kung fu. I'm not really into weights, nor do I have the time or money to attend a gym. The main muscles involved in straight punching are the triceps and these are well targeted with all manner of push ups and dips, etc.. I was wondering what you guys thought might be the best bodyweight exercise for the opposite side, the bicep. The best thing I can think of (and the only one that really targets the biceps as far as I can tell) is the chin-up, with your palms facing you and your hands close together. What do y'all think?