I never had a heart attack, but 8 years ago at age 60, I was hospitalized with congestive heart failure. Heart catheterization procedure showed no blockages, but I have a leaky valve (a murmur) and hypertension. I'm taking beta blocker, ACE inhibitor, and calcium channel blocker medications. The cardiologists tell me to exercise but with limitations...I'm not supposed to get out of breath to the point where I couldn't carry on a conversation. I can comply with that by biking if I take it easy. So, I ride slowly on MUPs in the park.