I am never surprised at the number of surfers I see with low back pain. Before I began doing Feldenkrais, my back would often hurt me, especially after surfing. Many of my friends that surf also experience the feeling of pain in the low back. The amount of extension surfing calls for really requires that the entire back be exquisitely organized for movement, something I don't often see.
I am often asked what to do about that pain you get in your back after surfing. For the generally lazy, who want to do essentially nothing to help themselves, there is always something called Static Back: lie on the floor and put both your legs up over the couch or ottoman such that your hips and knees are at 90 degrees. And yes, just lie there, for about 15-20 minutes. If there is any strain in your neck while you lie on the floor, place a small pillow under your head. There you go, much improved quite quickly.
If you prefer to do something a bit more active for your lower back, congratulations, you will get better faster. Visit my Free Feldenkrais Exercises page and do each of the first 4 lessons on the page. This will also take about 20 minutes, except you will fell vastly different and surprisingly relieved. Enjoy your relief and remember, you're not in this alone. Call me in Encinitas, CA for a free phone consultation: 760-436-2403.