A half marathon is a road running event of 13.1 miles (21.1 kilometers), which is half the distance of a marathon. It is a popular race distance for both experienced and beginner runners, as it is a challenging but achievable goal. Half marathons are typically held on a closed course, and runners have a time limit of three hours to complete the race.
The half marathon has grown in popularity in recent years, and there are now many races held all over the world. The most popular half marathon in the United States is the New York City Half Marathon, which attracts over 20,000 runners each year. Other popular half marathons include the Chicago Half Marathon, the San Francisco Half Marathon, and the Rock ‘n’ Roll Half Marathon Series.