The quintessential urban run, it's hard to think too much about your own petty failings as you remain constantly vigilant for muggers, flashers, and tiny dogs underfoot. Pass by the carousel and remember when you read The Catcher in the Rye in high school. Holden Caulfield’s brother died of leukemia; what's your excuse for being paralyzed by your own self-doubt? Before you think too hard about the answer, run through the zoo while trying not to think of how you too are trapped in a cage of your own making. Make sure to leave time for a ten-minute cool down of heaving sobs.