Governments could provide incentives to demonstrate the ability to run or even walk a short distance on an annual a basis. A tax rebate. Something.
It's impossible for everyone to be lean, fit and trim. But, it disappoints me, to a degree, when there are people who literally might have trouble walking a kilometer without falling short of breath. At least my idea would get them thinking.. Instead of an annual visit to their physician, an annual fitness test would be a better measure of their circumstances.