Re: Deadlift Form..
First, make sure to let the bar come to a complete rest after each repetition. Second, on your first rep you started with your shoulders just forward of the bar, but, on the other reps, you drifted back. Before you start a rep, make sure that you are positioned properly. Third, you need to put more weight on the bar. 45# looks too easy and it may be throwing off your form. Fourth, you are starting each rep with the bar in a different location. Start with the bar about one to two inches in front of the shins. When you squat down to grab the bar, your shins should be just touching the bar. Finally, the video is a bit grainy, so I can't be sure, but it looks like you are not maintaining the lumbar curve when you squat down to grab the bar. Have someone watch to see if is actually happening.