Have only run up to 10k before, now on a mission to get to 1/2 marathon distance. Got a sensible plan of 3 runs a week building up over a period of 16 weeks. Up to 4 miles twice a week and a longer run of 8 miles, normally do longer run on a Sunday morning first thing, 2 glasses of water and I'm off, managed to do it without stopping but it's HARD & I'm wondering if I should start to eat beforehand and what sort of time I should allow between eating and going out? Any useful advice welcome