Hopefully after learning some of the anatomy and conceptual lessons here you have a better understanding of why the “butt wink” is horse shit. In general, trainees should shove their knees out when squatting and this will allow proper depth. If a “wink” is occurring in a BW squat, it doesn’t fucking matter because it’s a Body. Weight. Squat. It’s used for conditioning and deuce dropping. When someone McCarthies a “butt wink” on a weighted squat and the trainee is shoving their knees out, that person is either a shitty coach, a pervert, or flamboyant because they are clearly staring at the lifter’s ass. Properly coached squats don’t really have “butt winks”, and if they do, I think it can be explained by their anatomy (and they aren’t a big deal anyway).