You might have been told to make a backswing where your left shoulder is under your chin. That way you know you've reached the top and can start down. This isn't the worst advice I've ever heard, but it's possible to turn that left shoulder under the chin without rotating your upper torso much at all--and that can put too much emphasis on the arms. It's better to focus on your hip turn. Ideally, your hips turn away from the target as much as they can. Here's a great drill for feeling the proper rotation: Make practice backswings while posting up on your right toe. Your right foot should be set back about two feet from its normal position (above). This allows the hips to turn freely. If you don't turn them, it's difficult to keep your balance at the top.