Surfers and Back Problems

I believe one of the main contributions to my back problems is surfing.  A few folks with whom I have spoken recently expressed surprise to learn that surfers regularly experience back problems.  Can anyone guess why this is so?

I think I know why, and I think it's a combination of things that may not all be obvious.  The good news is, I think there's a fix that does not require less surfing.  I won't spoil the fun with my conclusions just yet, but here's a partial hint (sorry Gerry):

Photo by Bill Romerhouse, available in large format print at Giant Surf Posters