Doctors who prescribe more activity want insurers to offer more coverage

Doctors have long prescribed exercise as part of rehabilitative programs for patients who've had heart attacks, undergone coronary bypass surgery, or experienced other cardiac problems. Insurance usually covers that rehabilitation for a few weeks. But a growing number of doctors are prescribing detailed exercise plans as a preventive measure before the health of high-risk patients deteriorates. And they'd like to see insurance cover those patients as well.