I'm just going to say that people that run multiple marathons in a year, like serious athletes, Olympians, don't look all that healthy to me. Scrawny, starving, kind of like I do when I get home after a long hospital visit from a flare. It looks like it takes a lot out of their bodies, so maybe 3 half marathons.
But I like the sloth type living when I can get away with it. I walk, I ran for a year and hated every step!