This question is a bit odd, so please bear with me. I have heard over and over again how the Glute-Ham raise is the single greatest exercise for hamstring development. My own expereince with it was that it was the toughest of all the hamstring exercises, and it built tremendous hamstring strength.
My question is: how? I understand the way it works the glutes, hams and calves, but since it only works the hamstrings in the knee flexion aspect, rather than the hip flexion, why is it so effective?