In the pantheon of running injuries, there is a well-established hierarchy. A recreational runner, finishing any marathon, or exerting themselves at half that distance, can expect to come down with delayed onset muscle soreness, otherwise known as DOMS. Starting from barely a twinge at the finish line, the pain rises in intensity over the next few days, with your quads telling you firmly that your running days are over. But then it fades and a week later you should be running like a spring lamb again.