The best application to be stronger in muscle-ups Muscle-ups require both pulling and pressing strength. Our fail-safe progressions will prepare your body for each element, so you’ll be ready to conquer the rig with a gymnast’s grace and power. The muscle-up is one of the most coveted CrossFit exercises that takes a ton of strength and practice to master. In concept, a perfectly executed muscle-up may not look all that difficult to master, but the grip and the movements often prove a bit unnat