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
2008 United States Olympic Trials (track and field) leading athlete did not hold an "A" standard, or an athlete withdrew, the next highest finishing athlete with an "A" standard was selected instead. The trials for the men's marathon were held November 3, 2007 in New York City, the women's marathon were held April 20 in Boston and the trials for the men's 50 km race walk were held February 9 in Miami, Florida. Key: 2008 United States Olympic Trials (track and field) The 2008 United States Olympic Trials for track and field were held at Hayward Field in Eugene, Oregon. Organised by USA Track and Field, the ten-day