Popularized by Mark Rippetoe, this "movement blocking" exercise works to improve your squat form. Just keep your toes right in front of PVC pipes, half foam rollers, or anything like that. Don't let your knees touch the object as you squat.
Note: This drill won't guarantee direct carryover to training settings involving moderate to high intensity workloads. Strength is specific to direction, load, exercise variation etc., so train as such.
Simply view this drill as a foundational movement technique to help make learning the squat easier with strictly internal resistance. Afterwards, add introductory squat exercises such as the front squat, low-load back squat, and goblet squat variations to add in external resistance appropriately.
It's very apparent to me that there are many coaches and fitness writers who don't understand the nervous system. I'm not the least bit surprised because your nervous system is arguably the most complex and ambiguous system in your body.
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You finished boozing it up over the holiday? Good. Cuz it's time to put what's left of your brain matter to use in understanding the nervous system and how utilizing it can make you stronger and better lookin'.