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. Evite ao máximo mexer os quadris ao longo do abdominal, como isso pode sobrecarregar a coluna https://www.tiktok.com/@renatocariani_mrc/video/7414680781056003333