So, about 10 years ago, I'd seen a few articles on the prevalence of the "squat-down-to-your-feet" stance in Asia, and the ease with which this stance could be reached by those who'd been doing it their whole lives, and its benefits as a low-energy sitting-position where chairs are unavailable & the ground is unappealing. But, I could get nowhere close without extreme ankle-knee-hip tightness & then, if I pushed, pain.<p>I thought, well, maybe I can gradually get that range-of-motion back for my adult body, with occasional tries/stretching.<p>After a few weeks of trying squats for a couple minutes most days, I was playing a typical game of basketball with friends, and landing from an unremarkable jump for a rebound, when my knee ACL snapped.<p>Quite possibly a coincidence! But even now, long after the recovery from ACL-replacement surgery, I can't muster any interest in trying those particular exercises again. And I wonder if ACL injury rates vary based on people/cultures where this stance is prevalent. (I could believe that actually <i>achieving</i> such squats involves longer ACLs, which might in the end be either positive or negative for sports-related ACL tears.)