We all have to struggle to stay healthy and in-shape as we get older. Believe me, it's hard as hell to get up in th morning and do aerobics and stretches. 
I personally don't do the gym thing because it's a waste of money. I get my equipment from Modell's and I use the local neighborhood park's outside tracks to run. I play tennis and rollerblade alot. I also study various forms of Karate and dance to House music.
So far, I've had (2) hernia operations (1994 and 2004) and the last one did a number on my used to be flat stomach. 
So let us all try to encourage each other to strive for a healthier lifestyle.
The following resources are great to keep access to because you may need them one day: