I filmed this after practice last night since I got about 10 emails asking what this was in my previous post.
This is by far one of my favorite "combo" exercises. At the studio I used to train at, they had one of those Keiser racks where the chin-up bar was 9 1/2 feet high. There were only a few trainers at the gym who could do this combo on that rack because you had to be able to jump (yes, I was one of them).
This chin-up bar isn't nearly as high (maybe 8 1/2 feet), but is still just as effective.
Enjoy your weekend!
Chris, CTT, CSCS