Boxing: Since 1904, boxing has been a part of the Summer Olympics. It was excluded from the 1912 Games held in Stockholm, Sweden, because Swedish law banned this sport. Till 2008, only men's boxing events were included. For the first time in 2012, women are participating in the sport. Light Fly, Fly, Bantam, Light, Light Welter, Welter, Middle, Light Heavy, Heavy and Super Heavy are included in the men's boxing events while women's events include Fly, Light and Middle.
Canoeing: Paddling a canoe is known as canoeing. It is classified into two disciplines, namely, flatwater canoeing and slalom canoeing. The two types of boats used in this sport are canoes with canoers or kayaks with 1, 2 or 4 kayakers. Men's events include Kayak Single (200m and 1000m), Kayak Double (200m and 1000m), Kayak Four (1000m), Canoe Single (200m and 1000m) and Canoe Double (1000m), while women's events include Kayak Single (200m and 500m), Kayak Double (500m) and Kayak Four (500m). The Canoe Sprint 200m race is being introduced for the very first time in the 2012 London Olympics.
Cycling: This Olympic sport is contested as a group of four disciplines, namely, BMX, mountain biking, road cycling and track cycling. Cycling is a part of the Summer Olympic games since 1896. That year, it was in the form of an 87km race. Road cycling was not a part of the 1900, 1904 and 1908 Olympic Games. It has returned to the Olympic sports list in 1912. Women have been participating in the sport since 1984. There are men's and women's events for each discipline of cycling. Road cycling comprises Individual Time Trial and Road Race for both men and women. Similarly, mountain biking and BMX have both men's and women's events.
Equestrian: It became a part of the Summer Olympic Games in 1900 and has been contested till date except for the 1912 Olympics when it was excluded. Dressage, Jumping and Eventing are the three disciplines of Equestrianism. It is one of the only two Olympic sports that involve animals. As a rule, the horses used for Dressage and Eventing should be at least 8 years of age and those used for Jumping should be at least 9 years old. The three disciplines are divided into two categories, namely, Individual and Team.
Fencing: Ever since the modern Olympic movement began, fencing is a part of Summer Olympics. It is done with the help of one of these three weapons: a foil, an epee or a sabre. Fencing is contested in the form of individual and team events for men and women.
Field Hockey: It became a part of the Olympics in 1908 after which it was removed in 1924. However, it was brought back to Olympics in the very next Summer Olympic Games in 1928. India and Pakistan were Olympic champions in hockey. Women's hockey was held for the first time in 1980.
Football: It has been a part of every Olympiad except for the years 1896 and 1932. It used to be a men's sport. In 1900, it was introduced as a medal sport. Women's football was introduced in 1996.
Gymnastics: It is divided into three forms, which comprise the disciplines of this sport. Artistic, Rhythmic and Trampoline gymnastics are the three disciplines. Artistic gymnastics includes events like Floor Exercise, Vault, Parallel Bars, Horizontal Bar and Rings, among others, for men and women. Rhythmic gymnastics consists of individual and team events for women while trampoline includes individual events for men and women. For the first 32 years after its introduction, only men were allowed to participate. In 1928, women took part in artistic gymnastics for the very first time. Rhythmic gymnastics made a debut during the 1984 Summer Olympics. Trampolining was introduced in the Sydney Olympics in 2000.
Handball: Handball is considered to be one of the oldest sports. It debuted in the 1936 Summer Olympics after which it was excluded. After a long gap of 36 years, it reappeared in 1972. Women's handball was introduced in 1976.
Judo: It became a part of Summer Olympics as a medal sport in 1964. Till 1988, only men were included and women took part in the demonstration sport. Female judoka were recognized for the first time in 1992.
Modern Pentathlon: Baron Pierre de Coubertin, the founder of the modern Games introduced modern pentathlon to Summer Olympics. It is a blend of five disciplines, namely, epee fencing, pistol shooting, show jumping on horseback, 3km cross-country running and 200m freestyle swimming. It was introduced in the Stockholm Olympics held in 1912. Women participated for the first time in this sport during the 2000 Sydney Olympics.
Rowing: Since the Summer Olympics of 1900, rowing is a part of Olympic events. Women's events were introduced in 1976 and lightweight-rowing events began in 1996. Interestingly, rowing is the only sport where the finish line is crossed backwards.
Sailing: This sport debuted at the Summer Olympics of Paris in 1900. Except for 1904 when it was excluded, sailing has always appeared on the Olympic sports list. Before the 2000 Sydney Olympics, the sport was called yachting.
Shooting: Since the origin of the modern Olympic movement, shooting has always been a part of Olympic games. It was excluded in 1904 and in 1928.
Table Tennis: Dominated by the Chinese, table tennis became a part of Summer Olympics in 1988. Singles and doubles for men and women are the events included in this discipline. During the early 20th century, the Soviet Union had banned this sport considering that it was harmful to one's eyes.
Taekwondo: After being a demonstration sport in 1988 and 1992, Taekwondo found a place in the list of Olympic sports in the Summer Olympics of 2000.
Tennis: Tennis is a part of the Summer Olympics since 1896. After being excluded in 1924 and being played as a demonstration sport twice, it reappeared in 1988. Tennis comprises men's and women's singles and doubles as also mixed doubles.
Triathlon: It was introduced during the Summer Olympics in 2000. The International Triathlon Union is in charge of the management and regulation of this sport. It includes men's and women's events. Brigitte McMahon from Switzerland and Simon Whitfield from Canada were the first Olympic Triathlon champions.
Volleyball: This Olympic sport has two disciplines, namely, beach volleyball and indoor volleyball. Both have events for men and women. Indoor volleyball was introduced during the Summer Olympics of 1964 while beach volleyball debuted in the 1996 Games. United States has dominated this sport, winning five of the eight medals awarded till date.
Weightlifting: It made its first appearance in the Summer Olympics in 1896 and reappeared in 1904. It is a part of the Olympic Games since the Summer Olympics of 1920. Since then, there has been a defined set of weight classes with weight limits for each. The classes and weight limits have changed over time. The one interesting rule that remains is, in case of a tie the lifter with lesser body weight wins.
Wrestling: It is a part of Summer Olympic Games since the modern Olympic movement began. It consists of events for both men and women. It is one of the oldest sports and was first included in the Ancient Olympics held in 708 BC. The longest wrestling match in the Olympic history was the one between Martin Klein (Russia) and Alfred Asikainen (Finland) during the Stockholm Olympics of 1912. It had lasted for 11 long hours!