One of my favorite drills for happier knees and heavier squats is what I like to call the heels-elevated hip thrust (or hip bridge, whatever you wanna call it).

Basically, it works like this: you lay on the floor near some sort of an elevation (a couch works great), and provided you first have your spouse's permission, you put your feet up on the couch and then bridge your hips toward the sky.

It looks a little something like this: https://youtu.be/p6zml5Z7ghM

So what are they good for?

Well, quit reading this description and go listen to the episode already!