Research shows - overwhelmingly shows - that a lack of exercise will reduce your healthy life span and raise the risk of suffering all of the most common age-related conditions. "Many of the chronic health conditions we experience as we age come from disuse rather than aging, and exercise can retard the onset of many of those conditions." We are living at the end of an era: real, effective therapies for aging could be as little as a few decades away. Regenerative medicine for age-related damage will help us to get there, starting in a decade or so. It would be a shame to miss the boat because you didn't take a little time and effort to stay in shape now. It's not rocket science, nor is it costly. So get to it!