Show jumping, also known as "stadium jumping" or "jumpers," is a member of a family of English riding equestrian events that also includes dressage, eventing, hunters and equitation. Jumping classes are commonly seen at horse shows throughout the world, including the Olympics. Sometimes shows are limited exclusively to jumpers, sometimes jumper classes are offered in conjunction with other English-style events, and sometimes show jumping is but one division of very large, all-breed competitions that include a very wide variety of disciplines.
People may often be confused by the difference between working hunter classes and jumper classes. Hunters are judged subjectively on the degree to which they meet an ideal standard of manners, style, and way of going. Conversely, jumper classes are scored objectively based entirely on a numerical score determined only by whether the horse attempts the obstacle, clears it, and finishes the course in the allotted time.
Jumper courses are often colorful and at times quite creatively designed. Jumper courses tend to be much more complex and technical than hunter courses, because riders and horses are not being judged on style. Hunters have meticulous turnout and tend toward very quiet, conservative horse tack and rider attire. Hunter bits, bridles, crops, spurs and martingales are tightly regulated. Jumpers, while caring for their horses and grooming them well, are not scored on turnout, are allowed a wider range of equipment, and riders may wear less conservative attire, so long as it stays within the rules. However, formal turnout is always preferred, and a neat rider gives a good impression at shows.
The more professional the competition, such as "A" rated shows in the United States, or the international "Grand Prix" circuit, the more technical the course. Not only is the height and sometimes width of an obstacle increased to present a greater challenge, technical difficulty also increases with tight turns and shorter or unusual distances between fences. Horses sometimes also have to jump fences from an angle rather than straight-on.
Unlike show hunter classes, which reward calmness and style, Jumper classes require boldness, scope, power, accuracy, and control; speed is also a factor, especially in jump-off courses and speed classes (when time counts even in the first round). A jumper must jump big, bravely, and fast, but must also be careful and accurate to avoid knockdowns and must be balanced and rideable in order to rate and turn accurately.

Grand Prix show jumping
Show jumping is a relatively new equestrian sport. Until the Enclosure Acts which came into force in England in the eighteenth century there had been little need for horses to routinely jump fences. But with this act of parliament came new challenges for those who followed fox hounds. The enclosures act brought fencing and boundaries to many parts of the country as common ground was dispersed amongst the wealthy landowners. This meant that those wishing to pursue their sport now needed horses which were capable of jumping these obstacles.
The first major show jumping competition held in England was at Olympia in 1907. Show jumping was first incorporated into the Olympic Games in 1912 and has thrived ever since, its popularity due in part to its suitability as a spectator sport which can be viewed on television.
The Horses
A show jumper must have the scope and courage to jump large fences as well as the athletic ability to handle the sharp turns and bursts of speed necessary to navigate the most difficult courses. Many breeds of horses have been successful show jumpers, and even some "grade" horses of uncertain breeding have been champions. Most show jumpers are tall horses, over 16 hands, usually of Warmblood or Thoroughbred breeding, though horses as small as 14.1 hands have been on the Olympics teams of various nations and carried riders to Olympic and other international medals.