I'm not a personal trainer, but I recall from my reading and my personal experience, you want the bar down along the scapula, not up high on the neck.
I think the most important part of the exercise is to initiate the move by pushing your hips back. I think by keying on this cue, and having the bar low, your back will be fine. Oh yeah, and maintain a nuetral spine position throughout...
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Hunter
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