The music at your gym SUCKS!!! No offense if you like it, but I hate lifting when that stuff is playing...it doesn't help get me motivated at all. It's so emotional...I was tearing up while I was watching the videos. I'm curious to hear the critique of your form because I look the same when I do mine...except that the round black things on the end of the bar are normally smaller. It looked good to me. Not sure about the breathing thing...I think I normally take a quick breath at the top of the rep or when I'm just starting the negative...it's so short that I don't relax my core muscles much at all. And the breath is expelled during the contraction caused by the push. Not sure if that makes any sense...