hold onto one of the wheelchairs Honestly, if you really want to do it, the very least you could do is just to try and run 26 miles anywhere. Then you know how long it will be, how knackered you will get, what happens to your feet, and where you are likely to stop, because for 0 training, I doubt you will make the whole 26 miles on your first go. THEN, once you realise what kind of task it is, you'll know if you can really be arsed. Alternatively, you could do as I say, do the 26 miles, realise what its going to take, and do some training for the next one.