The deep bodyweight squat is an essential movement pattern that you'll lose if you don't do it regularly. Do it at least once every day for 30 seconds.
If the deep squat isn't enough to satisfy your appetite, perform a set of goblet squats each day. The goal isn't to max out or go to failure but to simply use a good form with a moderate load. This will take your hips, knees, and ankles through a good range of motion while the core is stabilized.