Hands Free Jackoff
Try this if you're good in pull-ups. I lube my cock with water-based lube. Slip into a pair of boxer or cycling shorts. Place your cock up or in your shorts. Get on to the pull-up bar. Spread your legs and bring them back like a butterfly style. This gives a good climax. You shoot your load in your shorts.
It's more fun doing it in front of a mirror or in front of a handy cam and get the whole thing recorded.