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. Vale lembrar que todos os exercícios supra podem ser efetuados utilizando as pernas mais estendidas ou https://www.tiktok.com/@renatocariani_mrc/video/7414680781056003333