I'm sorry I don't have a video of this yet Rip, but I'm working with a masters age track cyclist doing your squats, and we're running into a problem. He's a 44 y/o guy with great leg speed but poor strength, so squats & deadlifts will help him a lot. We're using a modified PPST program to build him up and mixing it with track sprint work on the bike.
He has two problems I'm not sure how to fix.
I hope my description is clear :
Firstly, no matter how much we demand that he reach back with his hips in the squat, his hips drift forward at the bottom, his knees come way forward and he turns it into an almost front-squat squat, all quads. He's watched your video on squats with me, we've gone over SS ad nauseum, but it just doesn't matter what we do he drifts forward, after an initial good hip movement to initiate the descent once he gets to about 80 degrees of knee bend his hips and knees come forward. We've done the "get down and jack the knees apart with the elbows" thing, I've loaded him up with weight to get him deeper but it's just not happening at the bottom. His flexibility is junk, but I don't think it's a flexibility thing, I think it's confidence and posterior strength.
He spoke to his osteopath today and they discussed squats and this is his report :
I asked him to look at my squat position and why he thought I can't easily get into the correct position and why I can't get back and why I get that pain/soreness in the front which confused you and Merv on Wed. night.
Basically my gluteals are very weak and I am using my quads to support me. If I try to push back, it recruits more of the gluteals but because they are weak I want to come forward to prevent losing balance and toppling backwards. It's the gluteal media and gluteal minor which are at fault. This is just his opinion of course, he is no weights guru.
He suggested we come up with additional exercises/drills/lifts - whatever it takes to strengthen the glutes. During this time he really emphasised keeping the weight down and making sure technique is spot on. He mentioned something about during squats the main muscle groups need to activate and fire in order - A,B,C. That may not be happening and you may know more about what he was talking about than me.
So the osteo at least isn't saying "squats hurt your knees"! I'm not a huge fan of osteos, but he is and this one at least doesn't seem like a complete twit.
Now if that's the case (and I'm not sure that it is, but I'm at a loss) would you suggest that deadlifts might be a useful thing to do to get his posterior chain to work? Maybe even SLDLs to get the quads right out of it at first to build up his backside? He deadlifts reasonably well, at least in terms of technique, it's acceptable and we're improving it, but I have to fix his squat somehow.
The second problem is that we have a lot of trouble keeping his feet under his knees, his feet drift right out beyond 30 degrees as he goes down and his knees cave in, so there's no power out of the hole (what little hole there is because he doesn't go down and back far enough to really get into it!). Again, even doing unweighted squats onto a ball or bench doesn't seem to help this, I'm not sure if it's some weird hip flexibility thing. He explains that it's his anterior hip muscles that tighten up, but I can't see why, they're not really loaded or stretched much?
I will get a video of him doing this this weekend I hope, so we'll be able to show it to you, but in the mean time, your suggestions are much appreciated.