Physical activity programs, when offered in research settings, have been shown to improve quality of life and reduce fatigue among breast cancer survivors. The investigators are training Reach to Recovery volunteers at the American Cancer Society (New England Division) to provide a 12-week telephone-based physical activity program (RTR Plus) for breast cancer survivors. The comparison group of survivors will receive Reach to Recovery services (RTR). Physical activity, fatigue and other outcomes will be examined among 108 breast cancer survivors at the start of the program, at 12 weeks and 24 weeks. If the physical activity program is found to be effective, there is a potential for dissemination among the 13,000 Reach to Recovery volunteers across the U.S.