Allyson Michelle Felix is a retired American track and field athlete who competed in the 100 meters, 200 meters and 400 meters. She specialized in the 200 meters from 2003 to 2013, then gradually shifted to the 400 meters later in her career. At 200 meters, Felix is the 2012 Olympic champion, a three-time world champion (2005–2009), a two-time Olympic silver medalist, and the 2011 world bronze medalist. At 400 meters, she is the 2015 world champion, 2011 world silver medalist, 2016 Olympic silver medalist, 2017 world bronze medalist, and 2020 Olympic bronze medalist. Across the short distances, Felix is a ten-time U.S. national champion.
The women's 200 metres at the 2008 Summer Olympics took place on 19–21 August (final) at the Beijing National Stadium. The winning margin was 0.19 seconds. The winner had the second fastest reaction time in the final.
The women's 4 × 100 metres relay competition at the 2012 Olympic Games in London took place on 9–10 August at the Olympic Stadium. The victorious United States team broke the world record by over half a second. The previous record had been set 27 years previously by East Germany. The Jamaican team, 6 metres back, missed the previous world record by 0.04, but set a new national record. Another 7 metres back, Ukraine took the bronze, also setting a new national record.
The Women's 4 × 100 metres relay event at the 2011 World Championships in Athletics was held at the Daegu Stadium on 4 September.
The Women's 4 × 400 metres relay event at the 2011 World Championships in Athletics was held at the Daegu Stadium on 2 and 3 September. Friday and Saturday. This is a change in schedule from previous years when all the relays were at the end of the program. This might necessitate a change in strategy to allow for team members involved in other events.
Athletics at the 2016 Summer Olympics were held during the last 10 days of the games, from 12 to 21 August 2016, at the Olympic Stadium. The sport of athletics at the 2016 Summer Olympics was made into three distinct sets of events: track and field events, road running events, and racewalking events.
The men's 200 metres event at the 2016 Summer Olympics took place between 16–18 August in Rio de Janeiro, Brazil, at the Estádio Olímpico João Havelange. There were 77 competitors from 48 nations. The event was won by Usain Bolt of Jamaica, his third consecutive gold medal in the event. Bolt earned his eighth overall gold, needing only the 4x100 metres relay the next day to complete the sprint triple-triple. It was Jamaica's fourth victory in the event, second-most among nations. Andre De Grasse earned Canada's first medal in the event since 1928 with his silver; Christophe Lemaitre's bronze was France's first since 1960. The United States missed the podium for only the fifth time in the history of the men's 200 metres; it was the first time that it had done so in consecutive Games.
The men's 4 × 100 metres relay competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil was held at the Estádio Olímpico Nilton Santos on 18–19 August.
The men's 4 × 400 metres relay competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil was held at the Estádio Olímpico João Havelange on 19–20 August.
The women's 100 metres event at the 2016 Summer Olympics took place between 12 and 13 August at the Olympic Stadium. The winning margin was 0.12 seconds. The winner, Elaine Thompson from Jamaica, had the second slowest reaction time in the final.
The women's 200 metres competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil. The event was held at the Olympic Stadium between 15–17 August. The winning margin was 0.10 seconds. The winner, Elaine Thompson from Jamaica, had the fifth fastest reaction time in the final.
The women's 400 metres event at the 2016 Summer Olympics took place between 13–15 August at the Olympic Stadium.
The women's 4 × 400 metres relay competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil was held at the Estádio Olímpico João Havelange on 19–20 August.
The women's 4 × 100 metres relay at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 29 August.
The women's 4 × 400 metres relay at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 29 and 30 August.
The women's 4 × 100 metres relay at the 2017 World Championships in Athletics was held at the London Olympic Stadium on 12 August.
The women's 4 × 400 metres relay at the 2017 World Championships in Athletics was held at the London Olympic Stadium on 12–13 August.
The men's 4 × 100 metres relay event at the 2020 Summer Olympics took place on 5 and 6 August 2021 at the Olympic Stadium. There were 16 competing relay teams, with each team having 5 members from which 4 were selected in each round.
The women's 4 × 400 metres relay event at the 2020 Summer Olympics took place on 5 and 7 August 2021 at the Japan National Stadium. There were 16 competing relay teams, with each team having at least 5 members from which 4 were selected in each round.
The mixed 4 × 400 metres relay at the 2019 World Athletics Championships was held at the Khalifa International Stadium in Doha from 28 to 29 September 2019.
