Question: Cross country running is a sport in which teams and individuals run a race on open-air courses over natural terrain such as?

full_context: Document 1: Sara McGreavy: Sara McGreavy, born 13 December 1982 in Leamington Spa is an English and UK international athlete. Educated at North Leamington Community School and Arts College she excelled at cross-country. After joining the Leamington Cycling and Athletics Club she became interested in 100m hurdles. She won five times at The English Schools Championships over this distance. Sarah also runs 60m hurdles indoors.
Document 2: Sarah Storey: Dame Sarah Joanne Storey, DBE (née Bailey; born 26 October 1977), is a British road and track racing cyclist and former swimmer. She is a multiple gold medal winner at the Paralympic Games in both sports, and six times British (able-bodied) national track champion (2 x Pursuit, 1 x Points, 3 x Team Pursuit). Her total of fourteen gold medals makes her the most successful female British Paralympian of all time.
Document 3: Obstacle racing: Obstacle course racing (OCR) is a sport in which a competitor, traveling on foot, must overcome various physical challenges that are in the form of obstacles. Mud and trail runs are combined and the races are designed to result in mental and physical collapse. Obstacles include, but are not limited to, climbing over walls, carrying heavy objects, traversing bodies of water, crawling under barbed wire, and jumping through fire. Many obstacles are similar to those used in military training, while others are unique to obstacle racing and are employed throughout the course to test endurance, strength, speed and, dexterity. Races vary in both distance and challenge level, combining trail running, road running, and cross country running. With race venues typically in large cities, organizers encourage athletes of all types to participate. All Obstacles were introduced into Cross Country Running at Tough Guy, recorded on video 1989 - 2007. Most signature obstacles were actually created by Mr Mouse. According to the "Los Angeles Times" in 2012, the number of events—typically all-day festivals—rose rapidly. In accordance with the sub-culture's fast rate of growth, the "Obstacle Race Magazine" was launched.
Document 4: Cross country running shoe: Cross country running shoes are made for both cross country running and long distance running. Season-specific trainers are available for different types of training.
Document 5: Cross-country skiing (sport): The sport of cross-country skiing encompasses a variety of formats for cross-country skiing races over courses of varying lengths according to rules sanctioned by the International Ski Federation and by various national organizations, such as the U.S. Ski and Snowboard Association (USSA) and Cross Country Ski Canada. International competitions include the FIS Nordic World Ski Championships, the FIS Cross-Country World Cup, and at the Winter Olympic Games. Such races occur over homologated, groomed courses designed to support classic (in-track) and freestyle events, where the skiers may employ skate skiing. It also encompasses cross-country ski marathon events, sanctioned by the Worldloppet Ski Federation, and cross-country ski orienteering events, sanctioned by the International Orienteering Federation. Related forms of competition are biathlon, where competitors race on cross-country skis and stop to shoot at targets with rifles, and paralympic cross-country skiing that allows athletes with disabilities to compete at cross-country skiing with adaptive equipment.
Document 6: Cross country running: Cross country running is a sport in which teams and individuals run a race on open-air courses over natural terrain such as dirt or grass. Sometimes the runners are referred to as "harriers" (dogs). The course, typically 4 - long, may include surfaces of grass, and earth, pass through woodlands and open country, and include hills, flat ground and sometimes gravel road. It is both an individual and a team sport; runners are judged on individual times and teams by a points-scoring method. Both men and women of all ages compete in cross country, which usually takes place during autumn and winter, and can include weather conditions of rain, sleet, snow or hail, and a wide range of temperatures.
Document 7: Samantha Briggs: Samantha "Sam" Briggs (born 14 March 1982) is a CrossFit athlete best known for winning the CrossFit Games in 2013. She has qualified for the CrossFit Games four additional times: in 2010, 2011, 2015, and in 2016 (she failed to qualify in 2014 due to a poor performance on the handstand walk event at the European regional competition). She finished four of her five appearances in the top 5 overall. Briggs lived and trained in Miami, USA for the 2015 CrossFit season, but now resides in her native England.
Document 8: Trail running: Trail running is a sport which consists of running and hiking over trails. In the United Kingdom and Ireland it is also called mountain or fell running although the two types do differ. It differs from road running and track running in that it generally takes place on hiking trails, often in mountainous terrain, where there can be much larger ascents and descents. It is difficult to definitively distinguish trail running from cross country running. In general, however, cross country is an IAAF governed discipline that is typically raced over shorter distances (rarely over 12 kilometers), whereas trail running is loosely governed, and run over longer routes.
Document 9: Road running: Road running is the sport of running on a measured course over an established road (as opposed to track and field and cross country running).
Document 10: Cross-country skiing: Cross-country skiing is a form of skiing where skiers rely on their own locomotion to move across snow-covered terrain, rather than using ski lifts or other forms of assistance. Cross-country skiing is widely practiced as a sport and recreational activity; however, some still use it as a means of transportation. Variants of cross-country skiing are adapted to a range of terrain which spans unimproved, sometimes mountainous terrain to groomed courses that are specifically designed for the sport.
Document 11: Les Sheard: Leslie Sheard is an English school teacher, and rugby union and professional rugby league footballer who played in the 1970s, and 1980s, and coached in the 1980s, playing club level rugby union (RU) for Wakefield RFC, and playing representative level rugby league (RL) for England, and Yorkshire, and at club level for Castleford, Wakefield Trinity (Heritage № 777), York (captain), and Huddersfield, as a fullback , or centre , i.e. number 1, or, 2 or 5, and coaching club level rugby league (RL) for Huddersfield, as of 2009 he lives in Devon.<ref name="York Rugby League Club’s championship-winning team of 1980/1 to be re-united at a special dinner"> </ref>
Document 12: Sara McMann: Sara McMann (born September 24, 1980) is an American mixed martial artist and former Olympic wrestler. She is the first American woman in history to receive a silver medal in Olympic wrestling, which she won at the 2004 Summer Olympics in Athens, Greece. She wrestled in the Women's Freestyle 63 kg or 138.75 lb weight class. McMann won silver medal in the 2003 world championships and a bronze medal in the 2005 and 2007 world championships. She started wrestling at the age of 14 in Marion, North Carolina at McDowell High School.
Document 13: Beth MacGregor: Elizabeth MacGregor (born May 11, 1993) is an England women's cricketer She was born in Leytonstone and has played for the England Academy women's team in addition to representing her county side Essex. A left handed batsman and left arm medium fast bowler she replaced Anya Shrubsole in the England squad for the One Day International series against New Zealand in England in July 2010 having travelled with the Academy side to Bangalore in March. She was part of the England squad which toured Sri Lanka in 2010 and made her Twenty/20 debut on November 19 in Columbo. Recently she has been studying at Chigwell School for the past 5 years working towards her GCSEs and A levels.
Document 14: Winter triathlon: Winter triathlon is a multisport event involving the continuous and sequential completion of running, mountain biking, and cross-country skiing, all on snow. Course distances are set on the day of the event to achieve a winning time of around 80–90 minutes, after taking account of the snow conditions.
Document 15: John Graham (hurdler): John Graham (born November 20, 1965 in Moose Jaw, Saskatchewan) is a retired track and field athlete from Canada, who competed in the 400 metres and in the hurdling events. John Was University of Calgary's Athlete of the Year in 1985 winning the 300m and 600m, 4 × 200 m and 4 × 400 m races at Canada West and the National Collegiate Championships. In 1989, he won those same events again claiming the Canadian athlete of the meet for the second time. He represented his Canada on the national team from 1985-1991 and the 1988 Summer Olympics in Seoul, South Korea. John won three bronze medals in the Commonwealth games in 1986 and 1990. Along the way, John captured 11 National Championships and set numerous national records both indoor and outdoors.
ground_truth: dirt or grass