[KenWittlief]

I dont think an overweight person would give up his car and ride a bike, or walk 6 miles to work instead

but an overweight person might ride a Segway - I have to think that is better than riding in a car. If nothing else, at least you are standing up with your knees flexed, you are out in the air and the sun, and you are less likely to have a cream filled doughtnut in one hand and a cup of coffee in the other on your Segway.