You need to choose a golf club that has enough flex in the shaft, but not too much. It will depend on your ability to swing the club as the amount of flex you need. The flex is what allows the golf club to bend as you swing and connect with the ball. You will choose from the ladies flex, senior flex, regular, stiff and extra stiff flex. If the flex of the shaft is not matched with your swing, you could miscalculate your swing. A senior golf club has a little more flex that that of a beginning golfer.