Ngoc Tran, Meghan Flanagan, and Meredith Lufkin, all of Boston, passed out water at mile 25 with other volunteers from the University of Virginia Club, an alumni association. Will they ever run a marathon? "Every time I think about running a 5K, the couch just looks so much better," Lufkin said. "We're taking baby steps. Volunteer this year, and next year -- who knows?" added Flanagan.