Have a look at what Trevor.George is doing with his running.
Being a programmer his day was spent sitting looking at a screen, add to that enough Greek food for an army.
He was becoming a real ' chubby bubby', then this run for hours bug has set in,
Now, at 50 mumble he is in as good a shape as his 20 s. No gym fees either.
He is doing well thats for sure. I hate running. I used to run half marathons, then did a full one. After my knees took a week to recover I thought, bugger that! Some people are born for it!
I will do it the old fashioned way, pumping iron!