All good stuff, which we use to call muscle ups. Chin, than work into the top side of the bar with a form of dipping. Than back down again, for reps. Gymnast do this form of training. Part of it is keeping the body stable up and down. That side to side chin is excellent also. Can work into those planche's very well with the muscle ups, extra involvement with the cord (yeah, I know... over worked term) muscles. Abs get a lot of work. Like anything else, gets easier the more it's done.
Nice video offered by JME. Good reps done. Though using chains may give a better ideas (can get a pretty good idea of the amount of resistance/ratio/strength curve the more the chains leave the ground, lrength of travel/pull,etc). But to each his own in any kind of training.
