I watched a movie about a Half Dome free climb at Yosemite. The climber lived in a van and did finger pull-ups on a board like this. I really doubt I can do a finger pull-up, because I've never really been able to do a body-weight pull-up. But I thought it would be a cool thing for my gym to hang up. Good conversation piece. We have a close-knit group there and it will be fun to try out!