I am responding to Ian's word doc about where distance comes from...I had an experience over 20 years ago that changed my thinking about where distance comes from. I had a 5 time world wrist wrestling champion, yeh, big dude, prison physique, muscle bound, no flexibility, stongest person I had ever met, asked me if I would train him so he could be a long drive champion..this is back in the days of Big Cat and some cash was just starting to be made hitting it long. Anyway took him to a driving range, never had he ever hit a ball. He literally smoked it over 300 yards with zero technique, right out of the box with just raw strength.... To say that strength, arm and hand strenth is not one of the keys to hitting it long is nieve. Trust me, Powell is strong...to hit it deep you've got to be strong....I personally don't put much faith in the x factor and the idea of turning or spinning of the hips through impact for distance...All you need to do is hit some balls off a chair are watch someone hit it 300+ yards without legs to realize where the main source of power and distance comes. Check out this site...I think this guy has "scientific research" on the power source topic..www.kuykendallgolf.com