If you are obese, chances are that you live in an area that is not very walking friendly. Going from one store to the next requires a car.
Sell the car. The car is the bane (that which causes ruin or woe) of all obesity.
Move to a metropolitan city with big sidewalks. The Northeast ranks high with some of the fittest cities. (Scan the picture of times square, how many obese individuals can you count?)
Metropolitan areas make owning a car next to impossible. Retrain yourself to rely on walking to your destinations instead of driving where you sit for hours without any type of activity.
Humans are transient beings. If you sit around too much, fat will automatically gather around your legs and much more.