Decade-by-Decade guide to exercise. I have been exercising pretty regularly most of my adult life. I enjoy movement and find that when I am tired or stresses exercise energizes me. But I do know that the work-out I did years ago is not what I can do now. Oprah does a nice overview of exercise for various decades. With a birthday comming up in a few weeks I can't turn back the clock, but I can keep myself moving and feeling good. At my spin class last week a fellow spinner (30 year old) was amazed that I had three adult kids. Her comment brought a smile to my lips and more power to my old legs.