Agreed, I started bicycling regularly about two years ago, and it has vastly improved my overall health, focus, and drive. Getting sick in the winter used to be

Agreed, I started bicycling regularly about two years ago, and it has vastly improved my overall health, focus, and drive. Getting sick in the winter used to be the regular course of things -- I'd be knocked out for about a week or so with a cold or flu -- but the regular exercise and exposure to fresh air has kept me healthy in spite of everything. My productivity is higher, and my ideas more focused. I can only imagine the health benefits that would carry through into old age. There is certainly no silver bullet to living into a healthy old-age, but it seems clear that running, biking, swimming, or any other exercise could only help you. Combined with good diet, social activity, intellectual hobbies, and who knows -- Ray Kurzweil's predictions may come true. While biking the other day I came across this old dude (probably 70 years old) who was also on a bicycle up in the hills north of San Francisco. He was flying down this major hill, pedaling like mad, and the wackiest grin was on his face. When I'm old, I want to be that dude.