I think a lot of this boils down to perspective. There's obvious risks to a lot of activities if you have MG and how far you're willing to push your body and push your limits is up to each individual. Some perfectly healthy people like to jump out of planes. Regardless of anything else, they take a calculated risk each and every time they jump out of that plane that their parachute will open without fail. But when you're doing something you love to do, sometimes you accept the risk that comes with doing it. And sometimes, that risk isn't worth it. It's all about the individual's perception, reaction and acceptance of the level of risk. Me? I'll listen to my body, like I always have when running. If I'm having a bad day, I'm not about to push my body harder or further and damage myself more. But if I'm feeling good, then I might be more willing to take risks with it. Will other people understand that perspective? Maybe, maybe not. But it works for me and my life, and that's all that matters to me.

And to answer your question rogerm123, I completed my three leg (4.7, 4.5 and 7.0) without any trouble, at least not associated with MG. In fact, health-wise, I felt no different during the race than I did during my previous races. Despite the fatigue, the cold, the snow, the freezing rain, the seemingly gale-force headwinds and the stress that all of that plus running 16 miles puts on your body, I felt better than I have in quite a while. Although my legs are just a bit sore this morning...