Walking more could add as much as 11 years to your life, study says. Here’s how FortuneWant to live an extra 5 years? Those over 40 should exercise like this every day, researchers say CBS NewsThis Simple Daily Habit Could Add Up to 11 Years to Your Life SciTechDailyHow Millions of Americans Could Live 5 Years Longer NewsweekVideo New study finds exercise can extend your life ABC News