Chin ups and Pull-Ups are not really the same, here’s why! When doing a chin up your grip is supinated (palm facing you face) while the pull up the grip is pronated (palm facing away from you) The pull-up will mostly challenge the muscles of your upper back, lats. The chin-up works all of these muscles, but draw a bit more on your biceps. Therefore the chin up and pull up will hit your back almost the same, but because the range of motion and supinated grip chin up will hit biceps more. This is