Your chest muscles are important in the golf swing to support the club at the top and help pull the arms down on the golf swing. But if they are tight or you are muscle bond, then your backswing will be restricted and you will not be able to make a full turn at the top of the swing. Furthermore, your overly tight chest muscles will tend to take over the downswing, causing the over the top move and a faulty downswing.
Lie on your back with your legs extended and place your hands behind your head.
Allow your arms to drop toward the floor, trying to press your elbows to the floor.
Hold position for 8 to 10 counts.
Repeat exercise for 8 to 10 repetitions.
Note if both arms do not lay on the floor flat, then your chest muscles are tight and you will not be able to rotate your torso in the golf swing. One side may be tighter than the other, so stretch that side more to balance out the muscles.