I am looking at a point about 6 feet in front, and you cannot see my eyes in this video to verify this, I know. Just trust me here. And I do have a rather kyphotic thoracic spine -- it's probably fortunate that no front squat videos exist.
Blow:
1. I am not losing thoracic extension on the way down, at all. There is no change in the intervertebral relationships of my thoracic vertebrae. Cover my head with your thumb when you watch the video and you'll see that this is true. I tend to drop my head as I approach the bottom, and that may be creating the appearance of a gigantic thoracic shift.
2. The 'butt wink" that makes so many CFers uncomfortable is sometimes just a change in shape of the glutes as they stretch out in the hole, sometimes a genuine loss of lumbar extension. It is a rare heavy squat that does not show some of this (315 x 10 is heavy for me these days), and as long as it does not constitute a wholesale collapse of the lordotic curve, I just find it hard to be real concerned. Have you ever seen a real 1RM done with absolutely perfect form? Had I thought that it was excessive, I goddamn sure would not have allowed the video to be posted, and I would have corrected it the next time I trained.
3. I am driving my hips up in what I consider to be the correct use of the posterior chain. I am not off-balance in any rep, and my heels do not "float" on any rep.
All that having been said, I am not, nor have I ever been what I would consider a good lifter. I don't remember ever claiming to be. I am merely a decent writer and a reasonably effective coach. This squat looks acceptable to me with the exception of the premature chest raise about 3/5 of the way up. I do not insist on absolutely perfect form all the time, especially for more experienced lifters, because if I did nobody would ever lift weights that challenged their current ability. If I insisted on absolutely perfect form from myself, I'd never be able to train: I'm old, I'm injured just about everywhere, and I train by myself without any coaching input due to my fucked-up schedule. If the set of 10 was less-than-perfect, I can live with that. It's primary purpose was to show a few people that I actually still work relatively hard under the bar, and that I'm not entirely an armchair coach. I squatted 225 x 25 Sunday night, just so's you'll know, and it probably didn't look much better than the set of 10. If that renders everything I say about training null, then that's fine. Less typing here.
Now I know how Nietzsche must have felt, had he not been crazy as hell.