I signed up for an "urban environmental challenge" not really understanding what a trail run is. Or at least assuming it wouldn't be a true trail run because it was in New York City.
Well. I was wrong. I finished in 1:18:20, much slower than I anticipated, but whoa was it different than what I expected! Jumping over logs, running through brush, running across a stream. And holy god, the hills, both up and down, have shredded my thighs.
But it was so fun (at least in retrospect - I think at the time I wanted to die). I'm sore as hell today, but it was worth it!