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. By clicking “Accept All Cookies”, you agree to the storing of cookies on your device to https://madbookmarks.com/story18054963/detalhes-fic%C3%A7%C3%A3o-e-renato-cariani