I’ve had proximal hamstring tendinopathy (“yoga butt”) off and on for nearly a decade. It first showed up when I was teaching a lot of yoga, and flared again a few years ago when I ramped up my running. But now? It’s the best it’s ever been. And that’s after running a marathon—and steadily ramping my weekly mileage back up since the recovery period. One thing I suspect has helped enormously is this exact version of the seated hamstring curl. The machine is designed to lean your torso back. But w