I'm currently training for an intense obstacle course that's located up in Denver. I have no clue how to describe this place but basically they have all sorts of extreme challenges. Anyway, this course consists of about 40 feet of monkey bars, poles, rings, and ropes and is suspended about 30 feet in the air. You have to climb up a rope ladder just to get to the thing. (You do this thing while harnessed to a rope that's also hanging up there). I am told that only one in a thousand has made it all the way across the thing. At the end you have to climb up a PVC pipe and ring a bell. Then you are done. Anyway, I've been doing a ton of pullups to help train for this but one thing I'm doing to help is timing how long I can hang from a standard pullup bar. This is due to the fact that I have tried this course once and fell about a 4th of the way in. I was not happy about that and that's why I plan to go back. Right now I can hang from a bar for 1 minute and 45 seconds. This includes changing grips and moving around on the bar as necessary. The only rule is as soon as my feet touch the ground I stop the time. So, next time you have access to a pull up bar, try and see how long you can hang for. It's actually quite challenging. If you move too much you'll kill your fingers and end up slipping.