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