I go to cardio rehab three times a week now. I think I have to do this for the next, oh, six months. It's rather a pain in the ass, but I understand the need. It's not very difficult - they me hook up a portable heart monitor then I alternate between a treadmill, a stationary bike, and a stepping exercise as they monitor my heart rate, apparently looking for any anomalies and making sure that I'm progressing in my goal of getting stronger.
Along with the physical therapy comes education. Everyone gets to learn about exercise and diet, which has included learning how to read ingredient labels on food packaging.