Stiff no hack é tosco, ineficiente e perigoso

Existem coisas que me fazem perder a fé na humanidade, e esse exercício é uma delas!

Artigos citados:
Ebben WP. Hamstring activation during lower body resistance training exercises. Int J Sports Physiol Perform. 2009 Mar;4(1):84-96.McAllister MJ, Hammond KG, Schilling BK, Ferreria LC, Reed JP, Weiss LW. Muscle activation during various hamstring exercises. J Strength Cond Res. 2013 Oct 21. [Epub ahead of print]McGill SM, Karpowicz A, Fenwick CM, Brown SH. Exercises for the torso performed in a standing posture: spine and hip motion and motor patterns and spine load. J Strength Cond Res. 2009 Mar;23(2):455-64. doi: 10.1519/JSC.0b013e3181a0227e.