Most amateurs can hit it farther by improving there centerness of contact, path and angle of attack, and face squareness. After getting those dialed in get the driver (and other clubs) properly fit and they are golden for length AND accuracy. If they want to try fitness, make sure you are following guidance of a real expert and focus on flexibility. Otherwise you could potentially make things worse or cause injury.
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How can good amateurs get even more distance with their driver? Fitness? Swing Improvements?
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