So with all the publicity surrounding the 5:2 after the Horizon documentary, I wondered if anyone here was also doing this diet and following the C25K plan at the same time? A lot of what Mosley discovered in the programme made a lot of sense and the results it can generate (lower cholesterol/IGF-1/blood sugar etc) are changes I would like to make to my own general health, but I worry about running on fast days. Presumably the most sensible thing would be to fast on rest days. Anyone got any first hand experience to share? .