When I cleaned up some 17 odd years ago, I felt terrible for about six months. The only thing that gave me any real relief was strenuous physical activity.

I don't care for physical activity. I'm not sporty. I'm not very coordinated.

I get bursts of creativity with bursts of physical activity.

CrossFit is all about constantly-varied, high-intensity movements. And to do these movements, you have to have a certified coach to take you through this - or any type of physical activity.

I like the physical activity of gardening. It's kind of thrilling. I do a lot of weeding.

People who are making it to 100 live in environments where they are regularly nudged into physical activity.