We spent some time working on our Clean technique yesterday, specifically from a High Hang Position (begin with the bar very close to hips) to minimize momentum and focus on both the explosive hip extension and getting the bar cleanly and smoothly into the rack position. Too many of us are using way too much knee action when pulling from the hang or floor, and muscling the bar into position with the arms. That works alright with a lighter weight, but you’ll find it difficult to use a significant load.
Here’s a nice little article on racking the bar from Greg Everett at Catalyst Athletics.
Some Mobility WOD goodness from Kelly Starrett here.
And here’s some motivation to work on that rack position.