"The sky, the sky/ Hands up, hands up high/ Finish high, finish reverse C."
That's what golf pros were teaching back in the 1950s and '60s. The classic swing--big and full, finishing in a perfect "reverse C." Unfortunately, that same classic swing can put your average 50-year-old in the hospital. Top tour players like Jack Nicklaus, Lee Trevino, Tom Kite and Fuzzy Zoeller, to name a few, have at one time or another each been sidelined with career-threatening back injuries. Today even younger players like Fred Couples, Peter Jacobsen and Tiger Woods have closeted that backbreaking motion, along with their steel-shafted...