Your ability to control your torso can determine the path of your clubhead especially on the downswing. The stronger and more flexible you are can help you swing the club on the correct plane. This exercise not only improves core and gluteal strength, but also helps increase flexibility in your upper body.
Lie on back and get into Basic Bridge position.
Lace your fingers under your hips as you squeeze your shoulder blades together raising your upper back off the ground.
Hold position for 8 to 10 counts.
Do 8 to 10 repetitions.