Earlier quoted context omitted.
I've got to give the guy respect for giving references with his arguments but I don't think his sources are sufficient to suggest that marathon running is bad for you. It's a shame he loses much of that respect as we near reason #1 and they get increasingly 'silly'. Let's take #2: "At least four particiants of the Boston Marathon have died of brain cancer in the past 10 years. Purely anecdotal, but consistent with th…
The obvious problem wiht your retort is, of course, you're assuming that every year, the runners in the BM are new to the race. This isn't true. I'm not saying his reasoning is sound, but your rebuttle isn't either.
It's a 'back-of-a-napkin' calculation. Certainly not accurate but a nice place to start for future refactoring.