Well, at the time, I was leaning over gasping for air, heading for one of the working water fountains in the park, so I didn't really appreciate the comment. But it was nice to get an acknowledgment of one of the quirkiest workouts the park has to offer.
It's very simply, a fartlek ... a "fun" workout where you alternate running fast and slow over a wide variety of distances. Put another way: It's speedplay.
It gets you running fast over a wide variety of distances - in the southern half of the park, the hydrants can be spread out over 100-200 meters, in the northern half of the park (between GAP and 15th Street), you get some 800 meter distances. It's equally fun if you do it at dusk or at night (hey, is that a hydrant? Or a stump?).
You decide how fast you run. And especially during the first loop of the park, if you don't remember where the hydrants are, or can't see them ... it's a different workout every time. Do it with friends - and it doesn't matter if you end up doing the fast parts at different paces - just have the faster runners circle back and pick the slower runners up.