This event is enough to make grown men cry.
Actually I did see grown men cry - one on the first day when he tried to jump a stile, slipped in the mud and almost castrated himself
, the second about 16miles into day 2 being comforted by the emergency doctor, twisted knee and told he could not continue.
MM and AC - walking poles are allowed on the event if you are concerned about your knees. I ran without on day 1 and 2, because I thought it would be a hinderance, but then took one out on day 3, very useful on the descents and for forging your way through the mud. Lots of folks used them on this, although its not something I would usually bother with, if its allowed in the rules, then its worth giving yourself the option.