You can’t smash the ball without them
Power generation in a good golf swing comes from a number of muscle groups: the legs, core, back muscles, etc. But unless you have adequate forearm strength, you won’t be able to transmit the force created by those muscles into the club and ball, says Golf Digest fitness advisor Randy Myers.
“You’ll also struggle to set the club correctly during the backswing or release it through impact,” he says.
One warning sign that you lack sufficient forearm strength is how tightly you grip the club. Eighteen of the 35 muscles that control hand movements originate in the forearms. In many instances, a tight grip means those muscles are overmatched.
You should also be able to pronate and supinate your forearms, Myers says. Try this test: Extend your forearms while keeping the upper arms and elbows resting against the sides of your torso. With your hands clenched and thumbs up, try to rotate your forearms so the palm of each hand is facing straight up. Then rotate them until the palms are facing down. If you struggle accomplishing either or feel like you often hold the club too tightly, Myers prescribes these exercises ( right).