At age 72, I believe I am in good health because of my 25 years plus of aerobic exercises. I started exercising by joining the local gym in the early 80's. Their program consisted of jogging around the gym. Later I found an aerobics class through adult education school. I have seen a few changes over the years with the classes. We did jumping jacks, spinning around, and even tap dancing which is now a no-no, for older students. After some recent tests on my heart, my doctor says that my heart is strong, and with no blockages or thickening of the walls. I do have high blood pressure. So I believe that many years of aerobic exercise has helped me to maintain my healthy heart.