to agree with my body never to run after 4pm if I want to sleep that night. I think it's something to do with cooling down and hydration. If I were to do a long run at 8pm, I'd literally wake up every few minutes during the night, hot and thirsty. – Tim

and not eating. It is far more to do with what you've eaten the night before, or your general health and preparation. – ExhaustedThe gist of it seems to be to do what suits you. I try to make sure I've eaten well the evening before and am well hydrated before I

! Back-to-back long runs on Saturdays and Sundays are a very good idea. My plan would be to peak at 23 on Saturday and 25 on Sunday, practising the techniques, fuelling and hydration you plan to use in the ultra. – ChoistyAim to do do three 20-plus

. The first thing you should do after a run is stretch and re-hydrate. You can combine stretching with core exercises on an exercise ball – I got one for Christmas and they're brilliant. – Pit Stop CrewTry Pilates before your runHave you tried doing a Pilates