"Death By Pull-ups"
With a continuously running clock… Perform 1 pull-up the first minute, 2 the second, 3 the third, continuing as long as you are able.
Top Performances: Ted 405, Julian 20 Rounds. Christy 163, Jessica 9 Rounds (Red Band).
Kipping is necessary if you want to do a lot of pull-ups in a short amount of time. By opening and closing the body an athlete can generate momentum and use the total body to do a pull-up instead of just the arms. This requires a lot of timing and some explosive hip opening, but with practice your ability to do pull-ups will be limited not by your strength in your arms, but by your grip. Tight shoulders can also limit the kip by hindering the necessary swing through them at the bottom.
Coach Glassman explains the kip.