Exercise Intervention in Breast Cancer Patients With Treatment-Induced Arthralgia

Inclusion Criteria: * Post menopausal women with a history of estrogen positive breast cancer who are receiving aromatase inhibitors for at least one month. * Patients must complain of mild to moderate arthralgia. * Ability to understand and sign informed consent. * Patients meet criteria for low to moderate risk for moderate exercise based oon the ACSM guidelines. Exclusion Criteria: * Inability to comply with study requirements. * Metastatic breast cancer. * Patients with orthopedic or neuromuscular disorders that preclude participation in exercise. * Rheumatoid arthritis. * History of MI, angina or congestive heart failure. * Pregnant or lactating females. * Patients that are high risk for moderate exercise based on ACSM risk classification. * Patients who exceed minimal physical activity recommendations from the US Surgeon General's Report: Accumulation of 30 minutes or more of moderate physical activity on most days of the week. * Morbidly obese with BMI ≥ 40