If you're in your 20s, you might work out because it's fun, or because it makes you look better. But here's another reason to hit the gym or go for a jog — exercising now may help preserve your memory and cognition later in life.
Researchers figured this out by following 2,700 men and women for 25 years as part of the Coronary Artery Risk Development in Young Adults Study.
Usain Bolt, the Jamaican sprinter widely regarded as the fastest man alive, says he's thinking about hanging up his running shoes after the 2016 Olympics in Brazil.
The 27-year-old holds world records in the 100 and 200 meters and has six Olympic gold medals. But Bolt says that before retiring, he'd like to win gold in Rio de Janeiro as well as at next year's Commonwealth Games and best his own world record in the 200.