Keep some flex in your right knee
This helps your body to turn correctly, as well as shift the weight back and forth in the right direction too.
If you lock your right knee straight on the back swing you lock your body in place and tend to tilt your body leaving your weight on the left side at the top of the backswing.
This encourages hitting too steeply into the ground or topping the ball.
Next time you get a chance, have a practice swing and stop at the top and check your right knee.
If it’s locked straight practise keeping some flex in it or come and see me and I can show you how to do it.
Notice the golfers feet are both flat at the top of the backswing, this is the ideal top of the backswing position, try not to let the left heel come up off the ground if you can help it.
(Some older golfers may need to lift the left heel to complete their shoulder turn)
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