I'm trying to ensure my scapula is locked in, my lats are engaging/depressing, my arms are as long as possible. So when I start I don't get any power leaks... What you want to ensure is [your back] doesn't change position as you're pulling. I get up on the bar and I think 'big broad chest' as I'm setting my brace and everything, but I take my shoulders and I put them back and down... you want to think about your arm length too. I really want that shoulder to be as low as possible because... if we start a little too hiked up and retracted, that arm is going to leak out. So you want to think length: shoulders back and down, chest broad...