Sorry, the sound on this is terrible. This was posted over ten years ago. The key here is to press into and up the rack - Stripping The Rack. These are great for overhead presses, hack squats, bench presses, close grip benches (all from different angles). I am sure it is also great for pissing gym owners off. You can get close to the same with a smith machine, but you give up the tension that is created by pushing into the rack.
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