I attended 10 cardiac rehab sessions. I think they were useful for a couple of reasons. First, you are monitored with a running EKG in progress while you exercise. This is reassuring as you exercise and begin to test your exercise tolerance limits. Second, attending rehab gets you into a regular routine of cardiovascular exercise designed to improve your fitness level. This is particularly important for individuals who would not otherwise exercise. Since I already exercise daily, and the trek and expense to rehab was significant, I decided to withdraw from the program after 10 sessions. I do plan to resume workouts that elevate my heart rate into the target range for me. This will be in addition to my walking and my workouts with weights combined with stretching. It's important to keep active as we age to avoid the trap of becoming frail prematurely.