Russian twists are a common exercise that will build core and oblique muscle strength. Lay on the small of your back and upper butt. Your chest will be off the ground as well as your legs. Tuck the legs in so that your knees are bent and the abdominal muscles are contracted. Then, rotate your upper body side to side and touch the medicine ball on the ground. This will be much like the rotation of a golf swing, and will be extremely useful to your power. Do three sets of 25 reps.
Use a wall or partner and throw the ball from one side of your body and release it on the opposite side. Stand with your knees bent and rotate your torso back. Then explosively release the ball through. This exercise is much like the rotation of a golf swing and will help to build power and explosiveness which can lead to increased club speed. Do three sets of 10 for each side.
Back throws are a simple throw where you take the ball and hold it between your legs. Then, explosively jump upward and throw the medicine ball back and up over your head. This will increase back strength and explosiveness. It will also help with strength so that the strain put on the back in a golf swing is not a problem. Do three sets of 10 reps.
Toe touches are a common abdominal exercise that will be much more strenuous but also more beneficial with a medicine ball. In this exercise, lift your legs off the ground and point them toward the sky. Raise the ball to your toes and touch them. Then, bring the ball back behind your head on the ground and repeat. Focus on keeping the legs up and the abdominal muscles contracted. Do three sets of 20 reps.