I was playing tennis with a fellow a few years back. I was in my early fifties, and I would put him in his early sixties. He looked good and played well, matching me in singles play, stroke for stroke, sprint for sprint. Between games, I inquired about his health. 

TROY
So what’s the secret?

WISE MAN
The secret to what?

TROY (gesturing at his fit frame standing before me). 
To this. 

WISE MAN
When I was about your age, I met a guy about my age, a little older, and I asked him the same thing. 

TROY
Ok. 

WISE MAN
He said, if you stop moving, you die; if you keep moving, you hurt. So the key to a long life is pain management. 

I am finding this sentiment to be truer with every passing year. For the rare situations where, for whatever reason, I am not exercising, like with a recent illness, I am struck at how quickly my body begins to “set,” almost like someone is pouring sand into my joints and cement into my muscles. This is not something that takes months or weeks to begin but days and hours.  So the moral, in my eye, seems to be, keep moving or be prepared to stop moving altogether.