You're not wrong. In context here, I was in a running club, regularly racing half-marathons-usually running a longer distance than that at least once a week, as

You're not wrong. In context here, I was in a running club, regularly racing half-marathons-usually running a longer distance than that at least once a week, as one of 4 training sessions, and I'd run a marathon before. But training for my second marathon, I developed a niggle in my left hip. I tried to cut back on training but still do the marathon, as it wasn't far off; but on the day, 6 miles in, I tore my right calf (most likely because I had unbalanced my stride from the first injury). A torn calf takes weeks to recover from, but after I recovered from that I found I was still hirpling from the injury on the left. That was over a year ago, and while I don't limp any more, I still can't walk distances without pain, despite physio. The moral here being - don't attempt to run one carrying an injury.