Keep your left heel down
Not everyone is as flexible as Tiger Woods. Nobody is as flexible as he is! If you aren't flexible enough and you attempt to keep your left heel grounded as you swing, you're likely priming yourself for a reverse pivot. Instead, by allowing your left heel to raise, the body can shift its weight back and forward much more effectively.
Tuck your right elbow
If you tuck your right elbow too much, here's what will happen. First, your swing will likely be too flat at the top of your swing. If you stay tucked, your arms won't be able to swing freely down and through, meaning your body will have to compensate and either cause you to overrotate or come over the top of the ball (as I'm showing here). And in case you didn't know, coming over the top (from outside the target line to inside the target line) is never a good idea, as it produces all sorts of duffs, hooks and slices.
In this sequence, I'm doing the same thing. By letting my elbow drift up and away from my side as I initiate my downswing, it becomes a lot easier to keep my club perfectly on plane. And check out my impact position in both swings. My body is much more rotated here and in a much more athletic position.
In sports, where precise positioning is required, more often than not, the best way to accomplish your goal is to have the mind and eyes fixated on the target. Baseball players need to the see the baseball, primarily because it's moving at great speeds. They also don't have to fear hitting it too far, meaning they can swing at full throttle every time and not worry about a lengthy comebacker for par. Putting, like shooting a basketball, requires a deft touch that's best executed with help from the eyes. So selecting good golf drivers is important.
Now, back to my point. By keeping your head down, you stifle the body's ability to rock the shoulders through the stroke, invariably causing the hands and arms to collapse before, during or even after impact.
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