The investigators propose to compare the effects of a 12-week, supervised, site-based group yoga intervention on cognitive function, functional fitness, and well-being in middle-aged cancer survivors. Subjects will be randomly assigned to one of three exercise conditions: a yoga group, an aerobic walking group or a strength training group. All sessions (2-3 times per week) will be led by a trained exercise leader for a total of 150 minutes of exercise each week for the 12-week intervention.

Inclusion Criteria:

• 30-70 years of age
• Cancer diagnosis
• 1 year since last cancer treatment (surgery, chemotherapy, and/or radiation)
• Not planning to receive treatment during study period
• Completion of Physical Activity Readiness Questionnaire (PAR-Q)
• Ambulatory and absence of health conditions that may be exacerbated by yoga, walking, or strength training
• Physician consent (if deemed necessary)
• Low-active, i.e. less than 150 minutes/week of moderate to vigorous exercise, no current yoga practice (including within last six months)
• Intention to remain in the Champaign-Urbana area over the study duration
• Willingness to be randomly assigned to one of the three groups (yoga, aerobic walking, strength training)
• Comfortable with reading, writing, and speaking English

Exclusion Criteria:

• Below 30 or above 70 years of age
• Cancer diagnosis of the brain
• Less than 1 year since last treatment (surgery, chemotherapy, and/or radiation) or plans to receive treatment during study
• Determined ambulatory or 'high risk' based on responses to PAR-Q
• High-active (exercising more than 150 minutes/week in the last six months)
• No consent from physician
• Intent to be away from the Champaign-Urbana area for an extended period of time during the study
• Inability to communicate effectively in English