The review concluded that on average, runners live 3 years longer than non-runners, and that running does more to extend life than any other form of exercise.
Around 5,000 runners from the U.S. and abroad, many of them dressed as Chuck Norris, competed in the world's first Chuck Norris 5K. Standing at the finish line was the legend himself.
There've been big celebrations in Kenya and elsewhere after the Marathon runner Eliud Kipchoge became the first person to complete the distance in less than two hours.