The PGA Tour's ShotLink folks have put together a dynamite package of year-end stats to pour over and inevitably I gravitated to the driving distance page. In it they share this statistical confirmation that core exercises really are the difference between today's Nicklaus' and Watson's and Nicklaus and Watson.
The smaller the ball used in the sport, the better the book. There are superb books about golf, very good books about baseball, not very many good books about basketball, and no good books on beach balls. GEORGE PLIMPTON