400 metres in the context of 4 × 400 metres relay

Sprinting is running over a short distance at the top-most speed of the body in a limited period of time. It is used in many sports that incorporate running, typically as a way of quickly reaching a target or goal, or avoiding or catching an opponent.

In athletics and track and field, sprints (or dashes) are races over short distances. They are among the oldest running competitions, being recorded at the Ancient Olympic Games. Three sprints are currently held at the modern Summer Olympics and outdoor World Championships: the 100 metres, 200 metres, and 400 metres.

Antonina Vladimirovna Krivoshapka (Russian: Антонина Владимировна Кривошапка; born 21 July 1987) is a Russian sprinter who specialises in the 400 metres. She competed at the 2012 Summer Olympics, where her team originally was awarded a silver medal in the 4 × 400 m relay. Krivoshapka and her teammates were later stripped of this medal after Krivoshapka tested positive for the steroid turinabol.

The 100 metres, or 100-meter dash, is a sprint race in track and field competitions. The shortest common outdoor running distance, the 100-metre (109.36 yd) dash is one of the most popular and prestigious events in the sport of athletics. It has been contested at the Summer Olympics since 1896 for men and since 1928 for women. The inaugural World Championships were in 1983.

On an outdoor 400-metre running track, the 100 m is held on the home straight, with the start usually being set on an extension to make it a straight-line race. There are three instructions given to the runners immediately before and at the beginning of the race: "on your marks", "set", and the firing of the starter's pistol. The runners move to the starting blocks when they hear the "on your marks" instruction. The following instruction, to adopt the "set" position, allows them to adopt a more efficient starting posture and isometrically preload their muscles: this will help them to start faster. A race-official then fires the starter's pistol to signal the race beginning and the sprinters stride forwards from the blocks. Sprinters typically reach top speed after somewhere between 50 and 60 m. Their speed then slows towards the finish line.

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.

Combined events at the Summer Olympics have been contested in several formats at the multi-sport event. There are two combined track and field events in the current Olympic athletics programme: a men's decathlon (100 metres, long jump, shot put, high jump, 400 metres, 110 metres hurdles, discus throw, pole vault, javelin throw, and 1500 metres) and a women's heptathlon (100 metres hurdles, high jump, shot put, 200 metres, long jump, javelin throw, and 800 metres).

The first men's events came at the 1904 Summer Olympics: a triathlon had long jump, shot put, and 100-yard dash events, while an all-around championship saw athletes compete over ten events, forming the basis for the decathlon. No combined events were held at the subsequent games, but the 1912 Summer Olympics saw the introduction of the modern decathlon event and also a men's pentathlon (which lasted for three games). The first women's event came in 1964 in the form of the women's pentathlon. This was amended to include two more events, becoming the heptathlon at the 1984 Summer Olympics, reflecting the development of women's sport.

Jodie Alicia Williams (born 28 September 1993) is a retired British sprinter who specialised in the 400 metres, having begun her career concentrating on 100 and 200 metres.

A prodigious junior in the shorter sprints, she is the 2009 World Youth Champion at 100 and 200 m, the 2010 World Junior Champion at 100 m, the 2011 European Junior Champion at 100 and 200 m, and the 2013 European U23 Champion at 200 m.

Shaunae Miller-Uibo, née Shaunae Miller, (15 April 1994) is a Bahamian track and field sprinter who competes in the 200 and 400 metres. She is a two-time Olympic champion after winning the women's 400 metres at the 2016 Rio Olympics and again at the 2020 Tokyo Olympics.

At the World Athletics Championships, Miller-Uibo won silver medals in the 400 m in 2015 and 2019, and a bronze at the 200 m in 2017 when she also placed fourth at her longer distance. In 2022, she won her first world outdoor and indoor 400 m titles. She held North American records in the 400 m both outdoors and indoors until broken in 2024 and 2023 respectively. Her marks of 48.36 (improved at the Tokyo Games) and 50.21 seconds place her respectively eighth and joint 14th on the world all-time list. She holds world bests over the 300 metres outdoors and indoors.