Why 18 minutes? Because Covert Bailey always said in his Fit or Fat books to stay in an aerobic zone for at least 12 minutes a day in order to have the long term benifits of walking; and it takes the first 6 minutes of walking to ramp up into the aerobic zone. The aerobic zone is where you are breathing heavily, but can still carry on a conversation. If you are too winded to talk (or recite the alphabet), you are in the cardio zone and are burning sugar, not fat stores.
I figure what better way to make this a daily (or nearly daily) habit than to podcast as I walk — thus maintaining my aerobic/fat-burning/fat-thermostat-resetting zone. And while I walk, I will share whatever comes to my mind with you. So you can enjoy my missives from politics, the cosmos, science and invention, film and game production, stand-up comedy, the performing arts, and anything else I decide to put out into the universe.
I hope you will join me for a walk. Enjoy!