I just watched the first programme, and that was interesting, and made me feel a little exhausted just watching it!
It was amusing with the Doctor at the start, when he realised what he was planning on doing, and how much preparation time he had. All the people I've known who have run
one marathon have generally spent more time preparing themselves for it.
Given how much practise he seems to have done (or rather not done), it's amazing that he did it. He clearly had a very bloody minded attitude to doing it, and as one of the guys said, doing these sort of events is very much about the psychology of it.
Having said that, there's also no doubt that without people treating his feet and legs, there's no way he would have got around. Most of us do an event like a Marathon, and then collapse for a day (or week!) to recover. He didn't have that option, but having experts on hand to drain your blisters, wrap your feet in bandages, and massage your painful muscles, has to be very useful in such a situation!
It was also amusing when at the end, where the Rickshaw ran out of battery power and omph (I would suspect it was damned heavy with the film crew on board), and they ended up with some runners carrying the camera for them.
A damned impressive, and somewhat nutty achievement. I'll definitely have to watch the remaining episodes.