Communication & Peer Support Effects on Physical Activity in Overweight Postmenopausal Women

Inclusion Criteria: * Present a letter/documentation from a primary physician stating that they can participate in a physical activity program that will require walking up to 10,000 steps per day * Have a body mass index (BMI) between 25 and 40 kg/m\^2 (inclusive) * Be postmenopausal, defined as no period for 12 months if over age 55, or no period for 12 months; also, women who have had their ovaries removed will be considered as postmenopausal * Willing to participate in a wellness program that lasts 12 weeks and involves walking for at least 30 minutes a day on most days * Has access to a cell phone during the 12-week intervention * Functional knowledge of English (ability to both read and write) Exclusion Criteria: * Taking hormone replacement therapy within 3 months of enrollment * Taking Tamoxifen or Raloxifene within 3 months of enrollment * Enrolled in a weight management program, such as Weight Watchers * Engaged in regular, planned walking of at least 30 minutes a day * Previous history of breast cancer * Premenopausal * Age \> 75 years, to minimize co-morbidities * Cannot walk one mile