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Sport of jumping or falling into water from a platform or springboard

Diving is the sport of jumping or falling into water from a platform or springboard, usually while performing acrobatics. Diving is an internationally recognized sport that is part of the Olympic Games. In addition, unstructured and non competitive diving is a recreational pastime. Competitors possess many of the same characteristics as gymnasts and dancers, including strength, flexibility, kinaesthetic judgment and air awareness. Some professional divers were originally gymnasts or dancers as both the sports have similar characteristics to diving. Dmitri Sautin holds the record for most Olympic diving medals won, by winning eight medals in total between 1992 and 2008.

The Tomb of the Diver in Paestum, dating to 470 BCE, contains a fresco depicting a man diving into a pool or stream of water.

Although diving has been a popular pastime across the world since ancient times, the first modern diving competitions were held in England in the 1880s. The exact origins of the sport are unclear, though it likely derives from the act of diving at the start of swimming races. The 1904 book Swimming by Ralph Thomas notes English reports of plunging records dating back to at least 1865. The 1877 edition to British Rural Sports by John Henry Walsh makes note of a "Mr. Young" plunging 56 feet (17 m) in 1870, and also states that 25 years prior, a swimmer named Drake could cover 53 feet (16 m). The English Amateur Swimming Association (at the time called the Swimming Association of Great Britain) first started a "plunging championship" in 1883. The Plunging Championship was discontinued in 1937.

Diving into a body of water had also been a method used by gymnasts in Germany and Sweden since the early 19th century. The soft landing allowed for more elaborate gymnastic feats in midair as the jump could be made from a greater height. This tradition evolved into 'fancy diving', while diving as a preliminary to swimming became known as 'Plain diving'. In England, the practice of high diving – diving from a great height – gained popularity; the first diving stages were erected at the Highgate Ponds at a height of 15 feet (5 m) in 1893 and the first world championship event, the National Graceful Diving Competition, was held there by the Royal Life Saving Society in 1895. The event consisted of standing and running dives from either
It was at this event that the Swedish tradition of fancy diving was introduced to the sport by the athletes Otto Hagborg and C F Mauritzi. They demonstrated their acrobatic techniques from the 10 m diving board at Highgate Pond and stimulated the establishment of the Amateur Diving Association in 1901, the first organization devoted to diving in the world (later amalgamated with the Amateur Swimming Association). Fancy diving was formally introduced into the championship in 1903.

To win dive meets, divers create a dive list in advance of the meet. To win the meet the diver must accumulate more points than other divers. Often, simple dives with low DDs will look good to spectators but will not win meets. The competitive diver will attempt the highest DD dives possible with which they can achieve consistent, high scores. If divers are scoring 8 or 9 on most dives, it may be a sign of their extreme skill, or it may be a sign that their dive list is not competitive, and they may lose the meet to a diver with higher DDs and lower scores. In competition, divers must submit their lists beforehand, and once past a deadline (usually when the event is announced or shortly before it begins) they cannot change their dives. If they fail to perform the dive announced, even if they physically cannot execute the dive announced or if they perform a more difficult dive, they will receive a score of zero. Under exceptional circumstances, a redive may be granted, but these are exceedingly rare (usually for very young divers just learning how to compete, or if some event outside the diver's control has caused them to be unable to perform such as a loud noise). In the Olympics or other highly competitive meets, many divers will have nearly the same list of dives as their competitors. The importance for divers competing at this level is not so much the DD, but how they arrange their list. Once the more difficult rounds of dives begin it is important to lead off with a confident dive to build momentum. They also tend to put a very confident dive in front of a very difficult dive to ensure that they will have a good mentality for the difficult dive. Most divers have pre dive and post dive rituals that help them either maintain or regain focus. Coaches also play a role in this aspect of the sport. Many divers rely on their coaches to help keep their composure during the meet. In a large meet coaches are rarely allowed on the deck to talk to their athlete so it is common to see coaches using hand gestures or body movements to communicate. There are some American meets which will allow changes of the position of the dive even after the dive has been announced immediately before execution, but these are an exception to the rules generally observed internationally. Generally, NCAA rules allow for dives to be changed while the diver is on the board, but the diver must request the change directly after the dive is announced. This applies especially in cases where the wrong dive is announced. If the diver pauses during his or her hurdle to ask for a change of dive, it will be declared a balk (when the diver stops mid hurdle) and the change of dive will not be permitted. Under FINA law, no dive may be changed after the deadline for the dive sheet to be submitted (generally a period ranging from one hour to 24 hours, depending on the rulings made by the event organiser). It is the diver's responsibility to ensure that the dive sheet is filled in correctly, and also to correct the referee or announcer before the dive if they describe it incorrectly. If a dive is performed which is as submitted but not as (incorrectly) announced, it is declared failed and scores zero according to a strict reading of the FINA law. But in practice, a re dive would usually be granted in these circumstances.

The global governing body of diving is FINA, which also governs swimming, synchronised swimming, water polo and open water swimming. Almost invariably, at national level, diving shares a governing body with the other aquatic sports. This is frequently a source of political friction as the committees are naturally dominated by swimming officials who do not necessarily share or understand the concerns of the diving community. Divers often feel, for example, that they do not get adequate support over issues like the provision of facilities. Other areas of concern are the selection of personnel for the specialised Diving committees and for coaching and officiating at events, and the team selection for international competitions. There are sometimes attempts to separate the governing body as a means to resolve these frustrations, but they are rarely successful. For example, in the UK the Great Britain Diving Federation was formed in 1992 with the intention of taking over the governance of Diving from the ASA (Amateur Swimming Association). Although it initially received widespread support from the diving community, the FINA requirement that international competitors had to be registered with their National Governing Body was a major factor in the abandonment of this ambition a few years later. Since FINA refused to rescind recognition of the ASA as the British governing body for all aquatic sports including diving, this meant that the elite divers had to belong to ASA affiliated clubs to be eligible for selection to international competition. In the United States scholastic diving is almost always part of the school's swim team. Diving is a separate sport in Olympic and Club Diving. The NCAA will separate diving from swimming in special diving competitions after the swim season is completed.

Despite the apparent risk, the statistical incidence of injury in supervised training and competition is extremely low. The majority of accidents that are classified as 'diving related' are incidents caused by individuals jumping from structures such as bridges or piers into water of inadequate depth. Many accidents also occur when divers do not account for rocks and logs in the water. Because of this many beaches and pools prohibit diving in shallow waters or when a lifeguard is not on duty. After an incident in Washington in 1993, most US and other pool builders are reluctant to equip a residential swimming pool with a diving springboard so home diving pools are much less common these days. In the incident, 14 year old Shawn Meneely made a "suicide dive" (holding his hands at his sides, so that his head hit the bottom first) in a private swimming pool and became a tetraplegic. The lawyers for the family, Jan Eric Peterson and Fred Zeder, successfully sued the diving board manufacturer, the pool builder, and the National Spa and Pool Institute over the inappropriate depth of the pool. The NSPI had specified a minimum depth of 7 ft 6 in (2.29 m) which proved to be insufficient in the above case. The pool into which Meneely dived was not constructed to the published standards. The standards had changed after the diving board was installed on the non compliant pool by the homeowner. But the courts held that the pool "was close enough" to the standards to hold NSPI liable. The multimillion dollar lawsuit was eventually resolved in 2001 for US$6.6 million ($8 million after interest was added) in favor of the plaintiff. The NSPI was held to be liable, and was financially strained by the case. It filed twice for Chapter 11 bankruptcy protection and was successfully reorganized into a new swimming pool industry association.

Dives with multiple twists and somersaults are some of the most spectacular movements, as well as the most challenging to perform. The rules state that twisting "must not be generated manifestly on take off". Consequently, divers must use some of the somersaulting angular momentum to generate twisting movements. The physics of twisting can be explained by looking at the components of the angular momentum vector. As the diver leaves the board, the total angular momentum vector is horizontal, pointing directly to the left for a forward dive for example. For twisting rotation to exist, it is necessary to tilt the body sideways after takeoff, so that there is now a small component of this horizontal angular momentum vector along the body's long axis. The tilt can be seen in the photo. The tilting is done by the arms, which are outstretched to the sides just before the twist. When one arm is moved up and the other is moved down (like turning a big steering wheel), the body reacts by tilting to the side, which then begins the twisting rotation. At the completion of the required number of twist rotations, the arm motion is reversed (the steering wheel is turned back), which removes the body's tilt and stops the twisting rotation. An alternative explanation is that the moving arms have precession torque on them which set the body into twisting rotation. Moving the arms back produces opposite torque which stops the twisting rotation.

The rules state that the body should be vertical, or nearly so, for entry. Strictly speaking, it is physically impossible to achieve a literally vertical position throughout the entry as there will inevitably still be some rotational momentum while the body is entering the water. Divers therefore attempt to create the illusion of being vertical, especially when performing rapidly rotating multiple somersault movements. For back entries, one technique is to allow the upper body to enter slightly short of vertical so that the continuing rotation leaves the final impression of the legs entering vertically. This is called "Knee save". Another is to use "Pike save" movements of scooping the upper body underwater in the direction of rotation so as to counteract the rotation of the legs. Knee saves are performed for back entries and Pike saves are performed for front entries. The arms must be beside the body for feet first dives, which are typically competed only on the 1m springboard and only at fairly low levels of 3m springboard, and extended forwards in line for "head first" dives, which are much more common competitively. It used to be common for the hands to be interlocked with the fingers extended towards the water, but a different technique has become favoured during the last few decades. Now the usual practice is for one hand to grasp the other with palms down to strike the water with a flat surface. This creates a vacuum between the hands, arms and head which, with a vertical entry, will pull down and under any splash until deep enough to have minimal effect on the surface of the water (the so called "rip entry"). Once a diver is completely under the water they may choose to roll or scoop in the same direction their dive was rotating to pull their legs into a more vertical position. Apart from aesthetic considerations, it is important from a safety point of view that divers reinforce the habit of rolling in the direction of rotation, especially for forward and inward entries. Back injuries such as hyperextension are caused by attempting to re surface in the opposite direction. Diving from the higher levels increases the danger and likelihood of such injuries.

In Canada, elite competitive diving is regulated by DPC (Diving Plongeon Canada), although the individual provinces also have organizational bodies. The main competitive season runs from February to July, although some competitions may be held in January or December, and many divers (particularly international level athletes) will train and compete year round. Most provincial level competitions consist of events for six age groups (Groups A, B, C, D, E, and Open) for both genders on each of the three board levels. These age groups roughly correspond to those standardized by FINA, with the addition of a youngest age group for divers 9 and younger, Group E, which does not compete nationally and does not have a tower event (although divers of this age may choose to compete in Group D). The age group Open is so called because divers of any age, including those over 18, may compete in these events, so long as their dives meet a minimum standard of difficulty. Although Canada is internationally a fairly strong country in diving, the vast majority of Canadian high schools and universities do not have diving teams, and many Canadian divers accept athletic scholarships from American colleges. Adult divers who are not competitive at an elite level may compete in masters diving. Typically, masters are either adults who never practiced the sport as children or teenagers, or former elite athletes who have retired but still seek a way to be involved in the sport. Many diving clubs have masters teams in addition to their primary competitive ones, and while some masters dive only for fun and fitness, there are also masters competitions, which range from the local to world championship level.

Divers can qualify to compete at the age group national championships, or junior national championships, in their age groups as assigned by FINA up to the age of 18. This competition is held annually in July. Qualification is based on achieving minimum scores at earlier competitions in the season, although athletes who place very highly at a national championship will be automatically qualified to compete at the next. Divers must qualify at two different competitions, at least one of which must be a level 1 competition, i. e. a competition with fairly strict judging patterns. Such competitions include the Polar Bear Invitational in Winnipeg, the Sting in Victoria, and the Alberta Provincial Championships in Edmonton or Calgary. The qualifying scores are determined by DPC according to the results of the preceding year's national competition, and typically do not have much variation from year to year. Divers older than 18, or advanced divers of younger ages, can qualify for the senior national championships, which are held twice each year, once roughly in March and once in June or July. Once again, qualification is based on achieving minimum scores at earlier competitions (in this case, within the 12 months preceding the national championships, and in an Open age group event), or high placements in previous national championships or international competitions. It is no longer the case that divers may use results from age group events to qualify for senior nationals, or results from Open events to qualify for age group nationals.

In the Republic of Ireland facilities are limited to one operational pool at the National Aquatic Centre in Dublin. Other facilities with diving boards at the University of Limerick are undergoing staff training in an effort to start diving programmes.

In the United Kingdom, diving competitions on all boards run throughout the year. National Masters' Championships are held two or three times per year.

In the United States, summer diving is usually limited to one meter diving at community or country club pools. Some pools organize to form intra pool competitions. These competitions are usually designed to accommodate all school age children.

In the United States scholastic diving at the high school level is usually limited to one meter diving (but some schools use three meter springboards.). Scores from those one meter dives contribute to the swim team's overall score. High school diving and swimming concludes their season with a state competition. Depending on the state and the number of athletes competing in the state, certain qualifications must be achieved to compete in the state's championship meet. There are often regional championships and district championships which are necessary to compete in before reaching the state meet to narrow the field to only the most competitive athletes. Most state championship meets consist of eleven dives. The eleven dives are usually split up between two categories: five required (voluntary) dives and six optional dives.

In the United States, pre college divers interested in learning one and three meter or platform diving should consider a club sanctioned by either USA Diving or AAU Diving. In USA Diving, Future Champions is the entry level or novice diver category with eight levels of competition. From Future Champions, divers graduate to "Junior Olympic", or JO. JO divers compete in age groups at inter club competitions, at invitationals, and if qualified, at regional, zone and national competitions. Divers over the age of 19 years of age cannot compete in these events as a JO diver. USA Diving sanctions the Winter Nationals championship with one, three meter, and platform events. In the summer USA Diving sanctions the Summer Nationals including all three events with both Junior and Senior divers. USA Diving is sanctioned by the United States Olympic Committee to select team representatives for international diving competitions including the World Championships and Olympic Games. AAU Diving sanctions one national event per year in the summer. AAU competes on the one, three, and tower to determine the All American team.

In the United States scholastic diving at the college level requires one and three meter diving. Scores from the one and three meter competition contribute to the swim team's overall meet score. College divers interested in tower diving may compete in the NCAA separate from swim team events. NCAA Divisions II and III do not usually compete platform; if a diver wishes to compete platform in college, he or she must attend a Division I school. Each division also has rules on the number of dives in each competition. Division II schools compete with 10 dives in competition whereas Division III schools compete with 11. Division I schools only compete with 6 dives in competition. These 6 dives consist of either 5 optionals and 1 voluntary, or 6 optionals. If the meet is a 5 optional meet, then the divers will perform 1 optional from each category (Front, Back, Inward, Reverse, and Twister) and then 1 voluntary from the category of their choice. The voluntary in this type of meet is always worth a DD (Degree of Difficulty) of 2.0 even if the real DD is worth more or less on a DD sheet. In a 6 optional meet, the divers will yet again perform one dive from each category, but this time they will perform a 6th optional from the category of their choosing, which is worth its actual DD from the DD sheet. The highest level of collegiate competition is the NCAA Division 1 Swimming and Diving Championship. Events at the championship include 1 meter springboard, 3 meter springboard, and platform, as well as various swimming individual and relay events. The points scored by swimmers and divers are combined to determine a team swimming & diving champion. To qualify for a diving event at the NCAA championships, a competitor must first finish in the top three at one of five zone championships, which are held after the various conference championship meets. A diver who scores at least 310 points on the 3 meter springboard and 300 points on the 1 meter springboard in a 6 optional meet can participate in the particular zone championship corresponding to the geographic region in which his or her school lies. A number of colleges and universities offer scholarships to men and women who have competitive diving skills. These scholarships are usually offered to divers with age group or club diving experience. The NCAA limits the number of years a college student can represent any school in competitions. The limit is four years, but could be less under certain circumstances.

Divers who continue diving past their college years can compete in Masters' Diving programs. Masters' diving programs are frequently offered by college or club programs. Masters' Diving events are normally conducted in age groups separated by five or ten years, and attract competitors of a wide range of ages and experience (many, indeed, are newcomers to the sport); the oldest competitor in a Masters' Diving Championship was Viola Krahn, who at the age of 101 was the first person in any sport, male or female, anywhere in the world, to compete in an age group of 100+ years in a nationally organized competition.

Diving is also popular as a non competitive activity. Such diving usually emphasizes the airborne experience, and the height of the dive, but does not emphasize what goes on once the diver enters the water. The ability to dive underwater can be a useful emergency skill, and is an important part of watersport and navy safety training. Entering water from a height is an enjoyable leisure activity, as is underwater swimming. Such non competitive diving can occur indoors and outdoors. Outdoor diving typically takes place from cliffs or other rock formations either into fresh or salt water. However, man made diving platforms are sometimes constructed in popular swimming destinations. Outdoor diving requires knowledge of the water depth and currents as conditions can be dangerous. On occasion, the diver will inadvertently belly flop, entering the water horizontally or nearly so. The diver typically displaces a larger than usual amount of water.

A recently developing section of the sport is High Diving (e. g. see 2013 World Aquatics Championships), conducted in open air locations, usually from improvised platforms up to high (as compared with as used in Olympic and World Championship events). Entry to the water is invariably feet first to avoid the risk of injury that would be involved in head first entry from that height. The final half somersault is almost always performed backwards, enabling the diver to spot the entry point and control their rotation. Competitive high diving is run as the Red Bull Cliff Diving World Series.