Take The Squat Test
Perform this squat barefoot, in front of a mirror, five times from the front and five from the side. Go as low as you can, and be conscious of how your body reacts. "You'll see more compensations the farther down you go because your body needs greater flexibility and strength to maintain good form," says Aguilar. If one rep looks wonky, it may just be a fluke. If they all show the same problem, use Aguilar's tips to correct it.