Ive recently seen a dude at our uni’s gym do clap chinups and that was amazing. I think he plays for our basketball team. Anyway upon analyzing the excercise it seems that it could be a potentially superior back builder.
Since its explosive - it hits mostly your HTMR(high threshold motor units) and it shocks your CNS. And it has all the advantages of a real chinup. Imagine including 50 clap chinups/pullups in your back workout.
Its not easy to perform but its managable with heavy swinging - and then gradually improve your form to no swinging at all. Maybe even include some weight after a while(would have to be attached to the belt directly).
http://www.youtube.com/watch?v=KolPpY_z_1U - A crossfit vid. The guy swigns alot but its a start.