Web-based Lifestyle Program, mHealth and EMA Intervention, to Improve Weight Loss in Rural Stage I-III Postmenopausal Breast and Endometrial Cancer Survivors, HERO-C Trial

Inclusion Criteria: * Body mass index (BMI) ≥ 25kg/m\^2 * Age: 40-69 years * 1-5 years post-diagnosis of stage I-III postmenopausal breast cancer or stage I-III endometrial cancer * No known evidence of recurrence (local or distant) or second, primary cancer * No prior history of new other malignancy since their breast or endometrial cancer diagnosis (other than non-melanoma skin cancer) * Not currently participating in any weight loss programs, no personal trainer, and not meeting the physical activity guidelines * No use of any anti-obesity medications in the last 6 months and no plan to start anti-obesity medications during the study period * The ability to walk two blocks without a walker or cane * The ability to speak and read English * Have access to internet with a computer, tablet, or smart phone * Live in rural counties in Ohio and not planning to move away during the study * Are not pregnant, breastfeeding or less than 12-month post-partum and do not plan to become pregnant during the study Exclusion Criteria: * Severe medical conditions, such as unstable cardiovascular disease or digestive disorders, that would preclude physical activity and dietary intervention * Lack of physician clearance if determined necessary by the Physical Activity Readiness Questionnaire (PAR-Q+) * Acute physical limitations for unsupervised exercises at home * Unable to give informed consent