The Fit Nation special with all 8 races will air on Saturday, Nov. 19 at 2:30 p.m. ET. But the thing about obstacles is that when you overcome them, you’re usually better for it. Stronger. Smarter.

FOREST CITY | Running in the mud and carrying a sand bag on your shoulders while going up and down a ski hill might not be everyone's idea of a good time. However, Josh Sullivan of Forest City says he ...