On pressing movements, in lower phase is chest dominating and in upper phase triceps does more work. My question is about, pulling, lets take a chin-up/pull-up for example…
Lower Phase - From dead hang until elbows are at 90 degrees
Upper Phase - Elbows at 90 degrees until chin(head) over the bar.
when is biceps more working than back, when vice versa? And how does grip width and body angling change back/biceps involvement?