Long-distance running confined area. Early tracks were usually on flattened earth or were simply marked areas of grass. The style of running tracks became refined during the 20th century: the oval running tracks were standardised to 400 metres in distance and cinder tracks were replaced by synthetic all-weather running track of asphalt and rubber from the mid-1960s onwards. It was not until the 1912 Stockholm Olympics that the standard long-distance track events of 5000 metres and 10,000 metres were introduced. Long-distance road running competitions are mainly conducted on courses of paved or tarmac roads, although major events often finish on the track
United States Olympic Trials (track and field) United States Olympic Trials (track and field) The United States Olympic Trials for the sport of track and field is the quadrennial meet to select the United States representatives at the Olympic Games. Since 1992, the meet has also served as the year's USA Outdoor Track and Field Championships. Because of the depth of competition in some events, this has been considered by many to be the best track meet in the world. The event is regularly shown on domestic U.S. Television and covered by a thousand members of the worldwide media. As with all Olympic sports, the meet is