Yeah, it’s a use it or lose it kind of thing. That said, you can get it back. I’ve gotten back to the point where I can squat with feet flat on the ground where before I could only go halfway down (knees at 90 degrees, thighs parallel to the ground). It took months of effort, though, and I still don’t find it relaxing (but it’s a really good posture for gardening). Key thing was stretching my ankles…
Same thing for sitting cross-legged on the ground… it took a really long time for me to be able to stay seated on the ground for any period of time, let alone for a 20 minute meditation. Had to work up to it for several weeks.
