Participants will be recruited in two cohorts, one beginning early March and the other early June, 2012. The twice-weekly exercise classes will be 60 minutes in duration, running for 12 weeks. Classes will be conducted at Huntsman Cancer Institute's Survivor & Wellness Center, beginning one week after baseline physical assessments. Participants will receive a DVD of the respective class led by trained and qualified instructors so they can supplement classes with home-based sessions.