Exercise

     Any physical activity that maintains or enhances fitness and health is exercise.  When we move, walk, run, swim, dance, do physical work or play sports, when we lift, push or pull, when we stretch and keep flexible, we are exercising.
     Our distant ancestors who had to hunt and gather their food had a daily life full of exercise.  When they began to develop agriculture, the amount and type of exercise changed.  Their lives became more sedentary, and they lost some bone and muscle mass.  Even so, I'm sure the pioneers didn't have to jog or join a health club.  As society progressed, our physical strength and stamina decreased because we sit, ride, and use a multitude of labor saving devices.  We may be better off in many ways, but we are physically weaker and have developed health problems related to our sedentary lifestyles.
     So having basically the same body we did thousands of years ago yet decreasing our physical activity, we may have to go out of our way to get enough exercise.  Knowing what to do and doing it are two different things.  Aging can also complicate matters.  Making exercise fun may help us stick to it.  Move it or lose it.