There's probably a very basic truth at play here, @quietriver. Much like keeping in motion: the more you keep in motion, the better off you are; just as true for flexibility: the more you flex your moving parts, the better off you are. Example? I'd noticed after I'd finished my most sendentary rehab (post-sepsis) that I was having more difficulty raising and crossing my legs in order to trim nails, pumice rough spots, etc. I'm now making a point of raising and crossing my legs just to restore flexibility, or as much flexibility as may be stored; some may not be recoverable. ––Ray (@ray666)