What would you do if half your town caught triathlon mania? If you're like Alicia DiFabioa minivan-driving, harried mother of four small children whose daily look features stained yoga pants, a messy ponytail, and a big diaper bagyou would shrug your shoulders and try to hold on for that after-bedtime glass of wine. It was to her utter surprise that this middle-aged, out-of-shape mother found herself on the starting line of a triathlon...