1. back is rounding
2. no attempt to tighten your lumbar and get your back in extension
3. shin angle
4. you come over your knees on the way down on some.
lighten up the weight, read the chapter on DL
learn to get your back in extension. Pull with rounded back will cause problems
read the set up. bar of mid foot, start with straight legs, grab the bar without bending your knees, touch your shin to bar, that sets the hip height, pull your chest up hard, then pull
if you listen to the sound on the first pull, that is the bar hitting the plates becuase you didn't pull the sack out of the bar