I used to call kipping, trouting cuz it looks like a fish on the end of a hook.Nothin bugs me more in the gym than trouters on the chin bar. By doing strict, full hang pull-ups you can develop real good posterior, medial and anterial heads.My delts are ancient, but still going strong cuz of proper form in this movement in particular.They dont even bother me when I do deep weighted dips, a sure sign of healthy deltoids. Pleez dont kip, not even you cross-fit dudes! Who the hell started that?