Fortunately I'm in pretty decent shape. I skate once a week for 2 hours, take a weekly ZUMBA class and log 10,000+ steps most days on my fitbit. That was enough to manage the Warrior Dash, but barely. I definitely had the strength and agility to master the obstacles, but running between all of them, in the sun and on uneven surface, was a challenge. I might have had to walk if there hadn't been bottlenecks at 2 or 3 of the obstacles.
Did I mention it was also exhilarating fun? It's been a long time since I've pushed myself to my physical limits. Combine that with with temperate weather, ample sunshine and wonderful people to keep me company, and I didn't even mind publicly sticking a hose down my pants to wash mud out of my underwear.