foobar**
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In BORs you're supposed to keep your torso horizontal --> the lower back & hams are under isometric contraction throughout the set. It is possible that the lower back or hams get fatigued before the lats & other muscles involved in pulling the bar to the chest, and that results in a premature end of the exercise. It seems more logical to have your chest supported and focus your energy exclusively on the pull. Now if you want to work lower back & hams, there are other exercises (RDL, SLDL, GM). What do you think?