If you're continually missing PR attempts off the floor, try using block pulls off 3-4 inch blocks. This will allow you to challenge your hip and back position at an angle that mimics where the bar will be right after you get it off the floor.
Experienced lifters should do these with a quick set-up and a rapid descent.
related posts
Shut the Hell Up and Listen
Dave Tate has spent thousands of hours under the bar and training strong lifters to get even stronger. Listen up or stay weak.
Sucker Punch: Dan John
An in-depth discussion with Highland Games competitor, thrower, coach, teacher, and wise man of the iron game, Dan John.
Tip: Compound Set Combo Curls
Do 4 sets of 15 reps. On the first 10 reps of a set, do normal curls. On the last 5 reps of each set, switch to hammer curls.
Tip: Fix Your Push-Up
Most people can do a lot of push-ups... with terrible form. Here's how to fix that and build upper-body strength.