Kati Breazeal: Wrapping Your Thumbs: Gripping the Bar for Bar Muscle-Ups

WRAPPING YOUR THUMBS AROUND THE BAR - A big benefit of wrapping your thumbs is that it helps increase activation of the pulling muscle especially the lats. In a bar muscle the power comes from (besides your hips) the lats as shoulder extension drives you up and over the bar. Additionally, wrapping your thumbs is the safer way to grip.