P90X Chin-up Max &ndash; Pull-up Assist Band Helps build a strong V-shaped back and muscular arms Offsets some of the weight your muscles must support doing pull-ups and chin-ups Adjustable for optimal amount of resistance Safety hook, non-slip foot stirrup, heav-duty buckle for safety and support Designed for use with the P90X Chin-up Bar (however, fits most chin-up bars)