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. Aprecie também: A coleção do Veículos por luxo de Renato Cariani que deixaria colecionadores do boca https://socialwebleads.com/story3423052/abdominal-crush-fundamentos-explicado