These are two great exercises for the thumb & finger extensors. An absolute must to counteract all the gripping of a tennis racket or golf clubs.
This is a great exercise to keep your shoulders aligned and pain free. I like performing the external rotations in the side lying position to position the action of the rotator cuff directly against gravity, and to remove the shoulder blade elevators & neck muscles from the equation.
This is a great exercise for your wrist rotation. An absolute must if you play golf or tennis.