Dont know if I'm considered a "big guy" or not but at 6'1" 215, I know Im not small.
I do my WOD's about a week behind so I did this one today after about 5 hours of broken sleep at work last night. And the first 5 miles were all hills (kinda odd for this particular area in WI). And I guess it was hot? Oh, yeah, this was the farthest I've ever run by 5k.
Did it in 1:39:22. Every minute sucked.
But I did it.