Curls on Exercise Ball
In order to hit the ball longer, try building your core strength. Sit on an exercise ball and find your balance point. Take 15-pound dumbbells and do 10 curls with each arm. Take a 30-second break and repeat the set. It doesn't matter whether you do both arms at the same time or you alternate them.
This can be done with free weights or on an exercise machine. If you have a spotting partner, use free weights. Set the weight on your chest -- start off with 150 pounds if your are an adult male -- and press it up until you can lock your elbows. Do this 15 times and take a 30-second break before repeating the set. Start off with 75 pounds if you are an adult female. As your muscles develop, more weight can be added to keep the exercise challenging.
This is one of the oldest pieces of exercise equipment, but it is outstanding for building upper-body strength and endurance. Sit on the rowing machine and row for 10 minutes. This will build strength in your wrists, forearms, upper arms, shoulders and core.
Supine Spinal Twists
A flexible back and strong core is also key to improving clubhead speed. To perform this exercise, lay on your back with your legs raised at a 90 degree angle. With your knees together, extend your arms out and rest them palm-side down for stability. Then slowly move your legs to the right while keeping your knees together. Hold this position for 20-30 seconds, being sure to stop if any pain is felt. Then slowly bring your legs back to the center, pause, then bring the legs to the left. Repeat this exercise 2-3 times.