Inclusion Criteria:

- Histologically confirmed stage I-III breast or colorectal cancer

- 18 years of age or older

- Completed adjuvant treatment(for current malignancy)

- Completion of all adjuvant chemotherapy and radiation (with the exception of adjuvant
herceptin and/or tamoxifen/aromatase inhibitor therapy for breast cancer patients)
between 2 and 36 months prior to enrollment

- Ability to speak and read English

- Willingness to be randomized

- Medical clearance from an oncologist or primary care physician stating the
participant is able to participate in an unsupervised, moderate-intensity physical
activity program

- No major surgery within 2 months of study enrollment or planned during study period

Exclusion Criteria:

- Metastatic cancer

- Uncontrolled intercurrent illness including, but not limited to, symptomatic
congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or
psychiatric illness that would limit compliance with study requirements

- Plans to have hip or knee replacement within a year

- Participation in more than 60 minutes a week of moderate-intensity recreational
activity as assessed by the International Physical Activity Questionnaire Short Form

- BMI >47