Just back on the horse for running. I was working out last night, doing the royal marine circuits thing, went out for a run today, and oh my god it hurt. I was doing the mile and a half, which previously was a breeze. I wanted to get a good time, so I pushed hard on the first half mile, but soon the right part of my abs started to get MAJORLY sore. I had to stop after a mile, because the pain was so excruciating. It's still damned sore. Anyone have any similar experiences..? It's really put a dent in my confidence too, because it took me 7 minutes for the mile that I did. Perhaps I'm overtraining in the circuits, but it was fine before my exams started, and I've still been doing a lot of mountain hiking and stuff without a problem.