"If people feel like they're alone out there doing this, it's not worth doing," says Angela Atwood-Moore, a research associate at the National Institutes of Health. As the president of the NIH Bicycle Commuter Club, she's been instrumental in keeping the Bethesda campus' 600 bike commuters informed through a Web site and an e-mail list (to which 300 riders subscribe). Whether it's finding a mentor for a cycling newbie or coordinating meet-up points for Friday's Bike to Work Day (see details below), the club reinforces a sense of camaraderie.