Move over Triathalon, the 2009 Central Park Underwear Run (or if you prefer: the Running of the Balls) takes place tonight. The 1.7 mile fun run goes down every year prior to the big, and much more serious, Sunday race. The organizers have simple rules for this one: "No transitions, no timing chips, no expensive race gear, just 500 strangers running around in their underwear." We will say, this sounds a bit better than the naked bike ride, so we'll actually accept any photos you take if you should happen to stumble upon the sweaty half dressed mob.

The group will be attempting to get into the Guinness Book of World Records for most people assembled in their underwear. Registration is closed, but if you do want to be a spectator (they advise to "Wear shades, stare") just show up to Central Park at Dead Road by 7:30 tonight. More details (and video) here. And yes, Naked Cowboy will be there.