Crunching Too High The ab crunch is a subtle movement that lifts the shoulder blades a few inches off the floor. Jerking the shoulders up adds momentum and reduces the effectiveness of the exercise. Bring your shoulders 1 or 2 inches off the floor imagining you are bringing your ribs https://bookmarklayer.com/story18102837/orienta%C3%A7%C3%B5es-topo-da-renato-cariani