Ahhh, how quickly we descend to insult, especially where fattist issues arise.
I think, and as you are probably aware, kinggareth, your weight is not conducive to easy running, and may contribute to your arthritic conditions, certainly the pain you feel. But, plenty of runners are on the larger side, doesn't mean they can't run, just makes it that bit harder.
My own suggestion would be to take it very easy, don't worry about walking; in fact a steady 5mile walk every day won't interfere with your running but will, slowly, and I emphasise slowly, lose your weight.
I know you have an aim, the Tough Mudder, but I wouldn't worry too much about being fit enough for that, you won't be last (or first) but who cares, you'll have done it! And running all the way? I marshall our local park run and the back markers are walking after 500yards, but are we bothered? No, they get the same encouragement as any other runner - They're out there, and thats the point - giving it a go.
so carry on, just take it slow and easy, there's lots more runs/years to enjoy
As the course appears to be a guaranteed splash, I do like a pair of dry socks to change into!
And I know they're not the most popular of race mementos, but for regular runners they really are a useful memento (I've got a bag full of medals from 20 years+ of races, what is the point I sometimes think?)
You're not alone GP, I was in same position, 1 length and knackered, took lessons, got shouted at a lot, but eventually got to where I can do a 750M. How, by realising I could either be "quick" for 25M or terminally slow and get there, which I am - last out of the water every time - but more fun on the bike and run passing people!
WW is spot on re breathing, you just have to practice technique to where you can swim relaxed - speed? may never come, but who cares, you'll finish.
Why do I get the feeling that denting Billy Wilsons reputation is something that might be of very little concern to him?
The overall impression I got from the Tough Guy is that all runners are mugs, and the TG will get as much money as possible from them - but that's just my personal opinion, and the reason I wouldn't dream of entering it again.
Perhaps backing off may be the sensible way, TG not known for lying down and accepting the're in any way reasonable!