Geriatric researchers call gait speed "the sixth vital sign." Here's what your walking pace reveals about long-term health — and how to protect it.

If you had to pick one number today that hints at how independent you'll be in 20 years, most people wouldn't guess their grip strength. Longevity researchers would. Here's why grip strength has become one of the most talked-about markers of healthy aging — and three simple ways to build it without stepping into a gym.

Yoga and tai chi earn their reputation — I teach tai chi myself. But there's one thing neither practice does well, and it happens to be the thing research links most strongly to living longer. Here's the missing piece of the longevity puzzle, and how to add it in about an hour a week.