both gender categories as well as several age categories on each track, for each nation, and for the world. One of the most heavily contested records is the hour record, which involves simply riding as far as possible in one hour. The history of the hour record has been attempted by some of the greatest names in cycling from both road and track racing (including, among others, Major Taylor, Henri Desgrange, Fausto Coppi, Anna Wilson, Eddy Merckx, Francesco Moser, Jeannie Longo and Tony Rominger). Attempts are generally made at velodromes with a reputation for being fast. Recently, these have mostly been at high-altitude locations, such as Mexico City, Mexico or Aguascalientes, Mexico, where the thinner air results in lower aerodynamic drag, offsetting the added difficulty of breathing. Innovations in equipment and the rider's position on the bike have also led to dramatic improvements in the hour record, but have also been a source of controversy (see Graeme Obree). In 2019, the Pan Am Championships held at the newly built velodrome in Cochabamba, Bolivia, Kelsey Mitchell and Nicholas Paul broke the 200m world records in their respective gender categories. The track proved fast for many other events, with Pan Am records being set in nearly all timed events. See also Outline of bicycles Outline of cycling List of cycling tracks and velodromes Icetrack cycling Cycle speedway BMX racing References External links Union Cycliste Internationale (UCI) - Track Track Cycling News A humorous article that gives an idea of the track and riding it. Cycle racing by discipline Summer Olympic disciplines Articles containing video clips