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On days that Monica Vazquez, 27, a master trainer for New York Sports Clubs in New York City, can't do her usual run, she stuffs her essentials -- keys, cash, credit card, phone, and ID -- into a fanny pack and jogs home from work instead. "Running is a great workout, but it's also great transportation," she says. "Sometimes I get home even earlier than I normally do taking the subway."
Not a runner? Bike to work, get off your bus or train a few stops earlier, or park the car farther away to extend your walking time.