but the one thing I've had drilled into my head by three different people (all of whom have stood by me poking me with a stick while lifting, saying 'you're doing this wrong') is keep your back arched, chest up and stick your butt out, especially on squats and deadlifts.
Yep. That, and don't let your knees bow in during squats.
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Yep. That, and don't let your knees bow in during squats.