Relay race in the context of "Track-and-field"

Track and field is a sport that includes athletic contests based on running, jumping, and throwing skills. The name used in North America is derived from where the sport takes place, a running track and a grass field for the throwing and some of the jumping events. Track and field is categorized under the umbrella sport of athletics, which also includes road running, cross country running and race walking. Though the sense of "athletics" as a broader sport is not used in American English, outside of the United States the term athletics can either be used to mean just its track and field component or the entirety of the sport (adding road racing and cross country) based on context.

The foot racing events, which include sprints, middle- and long-distance events, race walking, and hurdling, are won by the athlete who completes it in the least time. The jumping and throwing events are won by those who achieve the greatest distance or height. Regular jumping events include long jump, triple jump, high jump, and pole vault, while the most common throwing events are shot put, javelin, discus, and hammer. There are also "combined events" or "multi events", such as the pentathlon consisting of five events, heptathlon consisting of seven events, and decathlon consisting of ten events. In these, athletes participate in a combination of track and field events. Most track and field events are individual sports with a single victor; the most prominent team events are relay races, which typically feature teams of four. Events are almost exclusively divided by gender, although both the men's and women's competitions are usually held at the same venue. One exception are mixed relays, in which two men and two women make up the four-person team. If a race has too many people to run all at once, preliminary heats will be run to narrow down the field of participants.

Swimming is an individual or team racing sport that requires the use of one's entire body to move through water. The sport takes place in pools or open water (e.g., in a sea or lake). Competitive swimming is one of the most popular Olympic sports, with varied distance events in butterfly, backstroke, breaststroke, freestyle, and individual medley. In addition to these individual events, four swimmers can take part in either a freestyle or medley relay. A medley relay consists of four swimmers who will each swim a different stroke, ordered as backstroke, breaststroke, butterfly and freestyle.

Swimming each stroke requires a set of specific techniques; in competition, there are distinct regulations concerning the acceptable form for each individual stroke. There are also regulations on what types of swimsuits, caps, jewelry and injury tape that are allowed at competitions. There are many health benefits to swimming, but it is possible for competitive swimmers to incur injuries such as tendinopathy in the shoulders or knees.

The 4 × 100 metres relay or sprint relay is an athletics track event run in lanes over one lap of the track with four runners completing 100 metres each. The first runners must begin in the same stagger as for the individual 400 m race. Each runner carries a relay baton. Before 2018, the baton had to be passed within a 20 m changeover box, preceded by a 10-metre acceleration zone. With a rule change effective November 1, 2017, that zone was modified to include the acceleration zone as part of the passing zone, making the entire zone 30 metres in length. The outgoing runner cannot touch the baton until it has entered the zone, and the incoming runner cannot touch it after it has left the zone. The zone is usually marked in yellow, frequently using lines, triangles or chevrons. While the rule book specifies the exact positioning of the marks, the colours and style are only "recommended". While most legacy tracks will still have the older markings, the rule change still uses existing marks. Not all governing body jurisdictions have adopted the rule change.

The transfer of the baton in this race is typically blind. The outgoing runner reaches a straight arm backwards when entering the changeover box or when the incoming runner makes a verbal signal. The outgoing runner does not look back, and it is the responsibility of the incoming runner to thrust the baton into the outstretched hand and not let go until the outgoing runner takes hold of it without crossing the changeover box and stops after the baton is exchanged. Runners on the first and third legs typically run on the inside of the lane with the baton in their right hand, while runners on the second and fourth legs take the baton in their left. Polished handovers can compensate for lack of basic speed to some extent, and disqualification for dropping the baton or failing to transfer it within the box is common, even at the highest level. Relay times are typically 2–3 seconds faster than the sum of best times of individual runners.

The marathon race walk mixed relay is a racewalking mixed relay event over the marathon distance that was first contested at the 2024 Summer Olympics on 7 August.

World Athletics and the International Olympic Committee introduced the race in April 2023. The distance of the race is that of a marathon; 26.219 miles or 42.195 kilometres. The relay involves two athletes, one man and one woman.

The International Olympic Committee recognises the fastest performances in pool-based swimming events at the Olympic Games. Men's swimming has been part of the official program of the Summer Olympics since the Games' modern inception in 1896; it was not until 1912 that women's events were held. The swimming events at the 1896 Olympic Games were held in a bay in the Aegean Sea with swimmers being required to swim to the shore—Hungarian swimmer Alfréd Hajós won two gold medals that year, saying "My will to live completely overcame my desire to win." The 1900 Summer Olympic Games in Paris had the swimming events take place in the River Seine, and the events at the 1908 Summer Olympics were held in a 100-metre pool surrounded by an athletics track in the White City Stadium in London.

Races are held in four swimming categories: freestyle, backstroke, breaststroke and butterfly, over varying distances and in either individual or relay race events. Medley swimming races are also held, both individually and in relays, in which all four swimming categories are used. In the Swimming at the 2024 Summer Olympics in Paris, both men and women competed in eighteen events in the pool. Of the 35 pool-based events, swimmers from the United States hold fifteen records, Australia five, France four, China, Canada and South Africa two each, and one each to Ireland, Great Britain, Russian Olympic Committee, Hungary, and Sweden. Nineteen of the current Olympic records were set at the 2024 Summer Olympics, seven in 2020, five in 2016, one in 2012, and three in 2008.