Had a heart attack in 2010 - the doc said it would have been a lot worse had I not been in good shape (riding 100 + miles a week)! Figure it was caused by stress since I'm my wife's full time caregiver. Any way, once cleared for cardio rehab I went at it pretty good (3 times a week plus walking as often as possible). Started adding strength training to regular cardio (treadmill, crosstrainer, row, etc.). Also, got back cycling when cleared for it.
Just went for my annual cardiologist appointment and my EKG was "textbook", blood work normal; he said to keep doing what I'm doing. I hit the gym two to three times a week and ride my bike as often as I can (15 - 20 miles per ride), mostly greenway - hey, I'm 71 and don't need to be "dicing" with cars. Anyhow, I'm in better shape than I was when I was 50, feel great and was able to reduce the medications and/or dosages considerably.