As an endurance athlete, I spent the better part of my twenties training for and running ultramarathons. My body was resilient, productively absorbing 60- to 100-mile training weeks and races just as ...

I expected rest—the do-nothing, on-the-couch type rest—to eventually heal me, but the pain persisted. I saw massage therapists, chiropractors, acupuncturists, bone and joint specialists, and nerve ...