Question: The most prevalent middle-distance track events are what?
About the article "Track and field", section "Middle distance".

Candidate passages:
Track and field is a sport which combines various athletic contests based on the skills of running, jumping, and throwing.
The name is derived from the sport's typical venue: a stadium with an oval running track enclosing a grass field where the throwing and jumping events take place.
The running events, which include sprints, middle and long-distance events, and hurdling, are won by the athlete with the fastest time.
The jumping and throwing events are won by the athlete who achieves 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", such as heptathlon and decathlon, in which athletes compete in a number of the above events.
Most track and field events are individual sports with a single victor, but a number are relay races.
Events are almost exclusively divided by gender, although both the men's and women's competitions are usually held at the same venue.
Track and field is often categorised under the umbrella sport of athletics, which also includes road running, cross country running, and race walking.
At the international level, the two most prestigious international track and field competitions are athletics competition at the Olympic Games and the IAAF World Championships in Athletics, while the International Association of Athletics Federations is the international governing body.
Records are kept of the best performances in specific events, at world and national levels, right down to a personal level.
However, if athletes are deemed to have violated the event's rules or regulations, they are disqualified from the competition and their marks are erased.
In North America, the term track and field may be used to refer to athletics in general, rather than specifically track and field events. 
Philip Aaron "Phil" Edwards, MD (September 23, 1907 – September 6, 1971) was a Canadian and Guyanese track and field athlete who competed in middle-distance events.
Nicknamed the "Man of Bronze", he was Canada's most-decorated Olympian and the first Black Canadian man to win a trophy at what are now known as the Commonwealth Games.
He was the first-ever winner of the Lou Marsh Trophy as Canada's top athlete.
He went on to serve as a captain in the Canadian army and as a highly regarded physician and expert of tropical diseases.__TOC__ 
Track and field competitions emerged in the late 19th century and were typically contested between athletes who were representing rival educational institutions, military organisations and sports clubs.
Participating athletes may compete in one or more events, according to their specialities.
Men and women compete separately.
Track and field comes in both indoor and outdoor formats, with most indoor competitions occurring in winter, while outdoor events are mostly held in summer.
The sport is defined by the venue in which the competitions are held – the track and field stadium.
A variety of running events are held on the track which fall into three broad distance categories: sprints, middle-distance, and long-distance track events.
Relay races feature teams comprising four runners each, who must pass a baton to their team-mate after a specified distance with the aim of being the first team to finish.
Hurdling events and the steeplechase are a variation upon the flat running theme in that athletes must clear obstacles on the track during the race.
The field events come in two types – jumping and throwing competitions.
In throwing events, athletes are measured by how far they hurl an implement, with the common events being the shot put, discus, javelin, and hammer throw.
There are four common jumping events: the long jump and triple jump are contests measuring the horizontal distance an athlete can jump, while the high jump and pole vault are decided on the height achieved.
Combined events, which include the decathlon (typically competed by men) and heptathlon (typically competed by women), are competitions where athletes compete in a number of different track and field events, with each performance going toward a final points tally.
The most prestigious track and field contests occur within athletics championships and athletics programmes at multi-sport events.
The Olympic athletics competition and World Championships in Athletics, and the Paralympic athletics competition and IPC World Championships in Athletics, are the highest and most prestigious levels of competition in track and field.
Track and field events have become the most prominent part of major athletics championships and many famous athletes within the sport of athletics come from this discipline.
Discrete track and field competitions are found at national championships-level and also at annual, invitational track and field meets.
Meetings range from elite competitions – such as those in the IAAF Diamond League series – to basic all comers track meets, inter-sports club meetings and schools events, which form the grassroots of track and field. 
The Asian Games is a quadrennial event which began in 1951.
The Olympic Council of Asia accepts only athletes who are representing one of the organisation's member states (most of which are within Asia) and recognises records set at editions of the Asian Games.
The Games records in athletics are the best marks set in competitions at the Games.
The athletics events at the Games are divided into four groups: track events (including sprints, middle- and long-distance running, hurdling and relays), field events (including javelin, discus, hammer, pole vault, long and triple jumps), road events and combined events (the heptathlon and decathlon). 
Henrik Ingebrigtsen (born 24 February 1991) is a Norwegian track athlete who specializes in middle-distance events.
He represented Norway at the 2012 Summer Olympics.
His younger brother, Filip Ingebrigtsen, is also a middle-distance runner.