I really enjoy drills where you work against your own tension and poor alignment so you must relax and align to succeed. One of those drills is to hold onto your shin or ankle with the same side hand and squat till the knee touches the ground. (careful not to put too much mass on it, keep from harm) Relax and rise up. In this drill put your mind on relaxing and aligning instead of pushing though your own body resistance and making those bathroom faces you see on muscle magazines. The purpose of the drill is more important than the drill itself.