Handstand Push Ups
We can't stress enough how important it is to move through a full range of motion. However, sometimes that's easier said then done though when we're talking about the bottom position of the squat. Feet under your hips, toes pointed slighlty out, big chest. Initiate from the hips, knees in line with the toes, sit back throough the heels. Crease of the hip below the crease of the knee, chest up, spread the floor. Sounds so easy...
Here's an exercise to help with the bottom end, courtesy K Starr and mobilitywod.com: