Half marathon in the context of "Dallas Marathon"

Road running is the sport of running on a measured course over an established road. This differs from track and field on a regular track and cross country running over natural terrain.

These events are usually classified as long-distance according to athletics terminology, with races typically ranging from 5 kilometers to 42.2 kilometers in the marathon. They may involve large numbers of runners or wheelchair entrants. Since the late 2010, some road running events also offer Nordic Walking as a separate competition along the same route. The four most common World Athletics recognized distances for road running events are 5K runs, 10K runs, half marathons and marathons.

The Carlsbad Marathon started out as the San Diego Marathon. It is said to be one of the oldest races on the West Coast. In 1978, The Heart of San Diego Marathon, was created and thus there were 2 marathons in San Diego. When InMotion Inc. was hired to put on the marathon, they made the decision to combine the two marathons and then eventually the marathon was moved from San Diego to Carlsbad.

For the marathon, the runners will need to complete 26 miles in the allotted time. For the half marathon the runner will need to complete a course of 13.1 miles.

Paula Jane Radcliffe (born 17 December 1973) is a British former long-distance runner. She is a three-time winner of the London Marathon (2002, 2003, 2005), three-time New York Marathon champion (2004, 2007, 2008), the 2002 Chicago Marathon winner and the 2005 World Champion in the Marathon from Helsinki. She was previously the fastest female marathoner of all time, and held the Women's World Marathon Record with a time of 2:15:25 for 16 years from 2003 to 2019 when it was broken by Brigid Kosgei.

Radcliffe is a former world champion in the marathon, half marathon and cross country. She has also been European champion over 10,000 metres and in cross country. On the track, Radcliffe won the 10,000 metres silver medal at the 1999 World Championships and was the 2002 Commonwealth champion at 5000 metres. She represented Great Britain at the Olympics in four consecutive games (1996 to 2008), although she never won an Olympic medal.

The 10K run is a long-distance road running competition over a distance of ten kilometres (6.2 miles). Also referred to as the 10K road race, 10 km, or simply 10K, it is one of the most common types of road running event, alongside the shorter 5K and longer half marathon and marathon. It is usually distinguished from the 10,000 metres track running event by stating the distance in kilometres, rather than metres.

As one of the shortest common road distances, many 10K races attract high levels of public participation. Among the largest 10K races, the Peachtree Road Race in Atlanta, United States had over 55,000 participants in 2011, while the Vancouver Sun Run and Bolder Boulder both had close to 50,000 runners. The popularity of 10K races lies in the fact that, for most adults, the 10K distance is long enough to represent a challenge but short enough to remain accessible for an untrained runner.

The Rock 'n' Roll San Diego Marathon is an annual marathon race held in San Diego, California. Established in 1998, it is the original race in the Rock 'n' Roll Running Series. The event includes a half marathon.