I find that road biking is "good for my back", because it takes my mind "off my back" by diverting my attention from the obsessive thought patterns that reinforce the neural conditioning that perpetuates back pain. Think it involves something of the same principle behind EMDR (Eye Motion Desensitization & Reprocessing) and Emotional Freedom Technique (EFT) "tapping". When you're biking, you're eyes are constantly darting around the landscape in front of you while concentrating on the process of turning the pedals which breaks up the obsessive scanning for trouble that reinforces and perpetuates your old pain pathways. Very similar to EFT tapping where you tap on the Gamut Point on the back of your hand while moving your eyes to different positions and rotating them. Well, as they say, "All roads lead to Rome" and if biking gets rid of your pain and anxiety, it's just as good as a lot of complex therapies with their associated complex theoretical bases. In other words, good for you, UkAdR. Sounds as though you've taken a big first step toward becoming pain free by confronting and overcoming fear. That's a real big one!