If you have ever been frustrated because your body would not produce the shot you had in mind, chances are that your muscles could not produce the full range of motion needed for the correct swing. If you have any restrictions in your shoulders, then you will have an abbreviated backswing and incomplete follow-through. It is important to stretch and strengthen shoulders so that the muscles are strong, supple and balanced to complete your backswing and swing freely through the shot.
Stand in upright posture with your neck in line with your spine.
Raise your right arm straight above your head.
Reach over your shoulder and touch the top inside corner of the opposite shoulder blade, palm facing inwards.
Hold position for a moment and return to the start position.
Repeat on opposite side.
Do 8 to 10 repetitions on both sides.