I used to run every other day. one day run, next day rest. (advice from Graeme Obree TV fitness) Ran for ten years. about five miles a day. Took 45mins to 1hour. Slow runner. never could get further. Was only a stone over weight. Yet i see grannies do the marathon on tv.
what's wrong with me.... It got to me in the end and i gave up the running for walking.