I see a little bend in DJ's shaft, but it's nothing out of the ordinary imo. The slowmo video is great, and gives a good idea of what you're doing with your legs.
GIF Warning:
Here is Dustin Johnson from transition to impacti-ish:
Here is you
Pay attention the right hip and knee. See the difference? DJ's right kneecap does not move for a few frames, it appears to actually go away from the target (to the left in the picture) and holds it's position, yours slides forward and actually rotates inward immediately before extending. This is because you're pushing off rather than rotating. It's understandable as that's what a lot of people are taught in order to avoid fat shots.
Now look at the left knee, see how DJ's appears to rotate counter-clockwise whereas yours is being pushed under your hipbone?
Add the two together, and DJ's knees gain separation (squat move) while yours do not. The cause of your flip is your hips having nowhere to go and stopping rotation very early. Your lag is fine for the first few frames of the downswing, but as soon as your hips stop rotating everything else catches up. Of course this probably manifests itself into thinking it's a flexibility thing, but very few golfers are flexible enough to recover from that sort of position.
So we know your hips aren't rotating, but it's much more complicated than saying to rotate your hips more or try to get your buckle to face the target. You can do those things fine and it still won't help your flip
The key imo is to give your hips the greatest range of motion and then allowing them to rotate as they should. This is done by the squat move that most great players have. In the squat move, your right knee should remain pretty still while your left knee opens toward the target (see DJ above). Jack, Hogan, Snead, old Tiger, Arnie, all the greats did it. Guys like Furyk do 50% of it, which may be why he's not a bomber.. but anyway it's not as easy as just squatting down unfortunately.
The easiest way to do this imo is to flare your feet (in your stance) a little, and start your downswing by pushing off the
outside of your right foot on a line parallel to it. That creates the external rotation you need in both hips (squat move) and gives you tons of room to get the hips around without resistance. Your left knee should naturally rotate counter-clockwise as a reaction to the movement, which will in turn open up your hips to the target. It's similar to what Sevam says (pre-turn your right foot, keep rotating clockwise), only I like the term pushing off instead of maintaining clockwise rotation.
Try it yourself, set up with both feet a little open and go to the top of the backswing. From there try pushing off the
inside of your right foot toward the target, then try to rotate. Now try going to the top again, and this time push off the
outside of your right foot, almost as if you are trying to get your right knee to move into the 4 o'clock position(from an imaginary view from above your head), then try to rotate. You can really feet the difference right? If you push off the left (slide), your left hip gets on top of your left leg and bears so much weight that it's difficult to rotate. Push off the other way and you open to the target in a much easier fashion.
I'd suggest getting that feeling, and then practicing that motion with half swings.
Hopefully that makes sense.
Last edited by Seadood228; 07-28-2014 at 02:45 AM.