I just got back from singing at a friend's house and she has a book called "Bicycling Bliss" - how to bicycle for wellness or something like that. I think I might have to get it - it's got chapters about yoga and breathing as well as the more usual "gear to get," and things to do if you've got unusual issues (lik ehaving had a broken neck, or poor balance). Found link:
http://www.bicyclingbliss.com/ (the website looks like it's self-published but the book didn't.)

What they thought was amazing was that the picture on the front looked strikingly like me ... a virtually identical smile and crinkling of the nose. I explained that yes, it was the bicycle that caused that expression :-) (the pictgure of the same person on the back of the book didn't look much like me at all, but she wasn't on the bike, then.)