From http://www.crossfit.com/cf-info/excercise.html#Power, Rip’s hip drive video.
Hip Drive, Mark Rippetoe [wmv][mov] ยป May 23 08
It wasn’t listed on the mainsite exercises and demos page for a long time until someone on the forum here spotted it. Score one for the BX forum.
Rip has a SS DVD too, but that clip shows hip drive better than the DVD does.
The guy in this video is getting into the problem GD talks about that people learning by Rips method tend to, he’s concentrating so hard on his hips that he’s folding forward as he drives up. The hip drive element is important, and still you have to keep your back angle the same.
Your squat shows what you already know, that your hamstrings aren’t engaged, especially as you pass parallel. About there or a little above you lose your hamstrings, your knees come forward and you drop straight down. It’s where your butt winks too so that’s a useful queue.
Some things you can try:
Hamstring length. MWOD stuff for hamstring length and external hip rotation.
If you can’t get the connection with your hamstrings, try squatting in well fitting jeans, or cycling/compression shorts or tight fitting stretchy boxers (not the loose fitting sort is what I mean). Something that will give you feedback that you’ve stopped pushing your butt back. I don’t mean workout in jeans all the time, I mean use them some of the time to learn what a good squat feels like.
Try box squats. Start high and with a light bar learn to squat with your shins at least vertical and then actually leaning back at least a little. The skills, flexibility and connection you’ll establish with your hamstrings will be unmatched.
Practise. Practise squats a lot. Lots of air squats, going for that same shins behind vertical position. It will seem impossible for a long time, like some sort of contortionists feat, but it is possible.
Have you ever seen a toddler sit on the ground? If you have you’ll have watched an almost perfect squat descent. They plop down by sending their hips back with their knees almost straight and chest up. They’re aided by their proportions and the fact they’re not trying to get back up again the same way, but that’s what you’re after. Don’t “plop”, control it, but if you could squat to below parallel and get back up again that way you would have to be powering it with your hamstrings. If you haven’t seen a kid do this, ignore that bit as it won’t make sense. Kelly Starret used the illustration in his presentation to Google staff and it hadn’t occurred to me before then, but he’s completely right.