It was not until I had passed the century station on the highway of life that I found the true value of regular exercise. From the time I was 70 until I was 100, I had been far from systematic in my exercising. During the summer season I did plenty of canoeing and fishing. During the fall I did considerable hunting and walking. There was nothing regular, however, in anything I did and during the winter and much of the spring I was having very little exercise.