It is a story told in gyms and doctors' offices across the world: someone hits their thirties or forties, and suddenly their body starts betraying them. A nagging ache in the shoulder, a sharp pain in the knee, or a stiff lower back turns everyday activities into a chore. For decades, the medical consensus was that joint degradation is simply an unavoidable part of aging, a result of "wear and tear." But groundbreaking research in physical therapy and biomechanics is proving this depressing narrative entirely wrong. You do not have to accept a future of chronic pain and limited mobility.This...