When my new cardiac rehab friend Jan started Troy Beaumont’s Phase III program, George W. Bush was U.S. president — in his first term. That was in 2004 — 14 years ago! — and aside from a few minor health issues, Jan hasn’t stopped exercising since. The Clarkston, Mich., resident says cardiac rehab keeps her mind and body strong and healthy, plus moving around beats sitting around at home. At the Troy, Mich., facility, Phase III cardiac rehabilitation includes a group-based, medically supervised exercise program, up to five days per week for one hour. Patients pay a nominal monthly fee not typically covered by insurance. Additional Phase III activities include…