Background: Physical inactivity has direct effects on risk of chronic diseases, mental health, quality of life, and early mortality. Women that engage in physical activity after a breast cancer diagnosis may reduce the risk of recurrence and death from this disease. This study examines postmenopausal women with clinical stage I or II breast cancer using the Patient Reported Outcome Measurement Information System (PROMIS) 10 – Global Health Survey, Fitbit Flex, and regular Wellness Coaching. Methods: Our prospective study follows clinical stage I/II, postmenopausal, ER+, Her2- women with BMI > or = to 25 beginning at their surgical consultation. Visits occur again post-operatively, six months after consultation, and again at one year. Each patient was given a Fitbit Flex with the expectation to complete 7,000 steps daily, and weekly Wellness Coaching. At each visit, a record of their activity was recorded including steps, heartrate, blood pressure, and body mass index. Quality of life was also assessed using PROMIS 10 - Global Health Survey. Results: 19 patients have enrolled. 100% of patients on study had BMI stay the same or decrease from initial consult to postop visit. 66% gained weight from initial postop visit to 6 months. 47% of patients met the daily goal of 7,000 steps. 80% showed significant increase in mental health scores and 60% increased physical health scores by PROMIS 10. Conclusions: Encouraging regular physical activity during treatment and survivorship for breast cancer can improve mental health and physical well-being during breast cancer treatment. Regular wellness coaching can support patients to reach their physical and mental health goals during treatment and survivorship.