Let’s review. Your goal is to stay as fit and healthy as possible for the rest of your life, what the gerontologists call "squaring the geriatric curve." You can control the rates of decline of your different physiological systems. How? By following the Four Pillars, which I've been detailing in a series of columns over that past month. (Each of the numbers below is a link to that specific article in the series.) So far I've covered the first three pillars, Consistency, Intensity and Recovery. Today, I'll finish the series with a focus on the fourth Pillar, Enjoyment.