Back squat 1-1-1-1-1-1-1 reps
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Pick loads that allow you to attempt to set a PR in the later sets. If you are not comfortable performing very heavy back squats, add a few reps to each set and drill your mechanics, but try to expose yourself to a load that is relatively heavy for you.
Back squat 3-3-3-2-2-1-1-1 reps