#1: Your upper back is not in extension at the start of the lift. In plain english, you need to straighten your back before you lift the bar. Think about making a big chest. Or, if you were a female, try to show us your tits.
#2: you should not deadlift in tennis shoes. Anything that has a squishy or compressible heel is not good since there is no solid base to push from. Chuck Taylor shoes are a pretty good choice, as well as olympic weightlifting shoes since the heel is fairly solid.
#3: do not jerk the bar off the ground.
#4: Each rep starts with the weight resting dead on the ground. No bouncing between reps. Each rep should be setup identically. The first rep should look exactly like the last.
#5: read this post on how to get into a proper set up position for the deadlift. http://www.strengthmill.net/forum/sh...55&postcount=2
#6: Understand that the center of mass of the system should be directly above the middle of the foot. The bar path should be nearly completely vertical and directly above the middle of the foot throughout the entire lift.
#7: It looks like you have bumper plates. Take advantage of that, you can just let the bar drop and just follow it down with your hands. Don't try to control a heavy weight while lowering it.
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