Depends on your goal for the exercise. I use a knees-only vertical torso position for athletes who have difficulty finishing their extensions w leg drive and tend to instead quit early with the legs and over-emphasize hip extension, or for those who tend to shift forward on the feet too soon.
That position would be a slightly different (higher) bar position than a high hang w hip flexion - the latter would in fact be mimicking the proper position during a lift from the floor (even though that lifter may not actually be in that proper position when lifting from the floor).
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