I have never heard of rack pulls before, but looked it up and it seems to me that they're like dead lifts, but you partly do it? To me is seems that you should wear a belt if trying to go heavy at your end sets. So you don't pull your back, and hurt, or damage those muscles. I lift at home, and don't have a belt, so I try not to go too heavy. Most gyms should have them though.
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