Absolutely. The government should only exist, according to the US Declaration of Independence, for safety and happiness. However, the way it is structured now having the government pay for walking will actually save significant everyone money, make people much healthier, reduce energy consumption, reduce air/noise pollution, boost productivity and increase individual and overall happiness. So until the government is completely out of paying for healthcare this is an excellent solution for significantly reducing costs and having all the above benefits and more.

In answer to donnajones,
Perhaps I should also be paid for eating healthy foods rather than junk food and for brushing my teeth and bathing. And in addition, shouldn't I be paid for not smoking? (SARCASM, of course!)
Actually, we ARE paid for doing such...we're paid with better, even if not perfect, health. Must we be bribed with money to do what we know we should do?
I plan to continue to DO my best as long as I'm able in spite of my age and health concerns. Of course a bit of extra money would always be nice, but there are better ways than having the government pay me to use my common sense!