Inclusion Criteria:

- Female breast cancer patients between the ages of 18 and 70 years of age with a
diagnosis of Stage I, II, or IIIA breast cancer who are currently taking aromatase
inhibitors or selective estrogen receptor modulators for the next 8 months.

- English speaking

- Medical clearance for participation provided by primary care physicians

- If the patient has undergone a surgical procedure, must be at least 6 weeks
post-procedure

Exclusion Criteria:

- Diagnosis of dementia or organic brain syndrome

- Medical, psychological or social characteristic that would interfere with ability to
fully participate in program activities and assessments (e.g., psychosis,
schizophrenia, etc.)

- Contraindication to participation in a regular physical activity program.

- Metastatic or recurrent disease

- Inability to ambulate

- Engaged in >/= 60 minutes of vigorous physical activity or >/= 150 minutes of
moderate plus vigorous physical activity per week during the past month.