Cure your overswing
1
People who tend to overswing lose the concept of how far the club is going back and think it’s neutral at the top or going back to the right position. A good way to remedy things is to try and feel that your left arm is travelling to no further than parallel from the ground. Swinging to what you feel is a half or three-quarter backswing length will often actually get you swinging to the correct length.
2
Having a poor hold on the club can also lead to an overswing. One of the best things you can do is to shorten your left thumb to help support the club more. The tip of your thumb should be about half to three-quarters of an inch away from the tip of the knuckle on your forefinger. People who wear a hole in the thumb of their glove are often overswingers who have their left thumb too flat, so it just gives way at the top. 3
Too narrow a backswing can also cause an overswing as the left arm folds at the top, rather than extending. You need to swing as far to the right as you can without swaying your upper body. If you were to drop a golf ball from your hands as your backswing nears the top, as here, it should fall some way from your foot as you create lots of width, rather than close to it if everything is too narrow and your left arm has collapsed.