The obesity epidemic is global: 2.1 billion people, or about 29% of the world’s population, were either overweight or obese in 2013, and nearly two out of three of the [...]

Some people overcome the midday slump at work with caffeine. Shelly Fireman re-energizes by hopping on the elliptical machine in his office. Mr. Fireman, in his late 70s one of New York City’s most successful [...]