The high jump athletics Olympic Games of ancient Greece

The high jump is a track and field athletics event in which competitors must jump over a horizontal bar placed at measured heights without the aid of certain devices in its modern most practiced format; auxiliary weights and mounds have been used for assistance; rules have changed over the years. It has been contested since the Olympic Games of ancient Greece. Over the centuries since, competitors have introduced increasingly more effective techniques to arrive at the current form.Javier Sotomayor (Cuba) is the current men's record holder with a jump of 2.45 metres (8 ft 0.46 in) set in 1993 and is the longest standing record in the history of the men's high jump. Stefka Kostadinova (Bulgaria) has held the women's world record 2.09 metres (6 ft 10.28 in) since 1987, also the longest-held record in the event.

The first recorded high jump event took place in Scotland in the 19th century. Early jumpers used either an elaborate straight-on approach or a scissors technique. In the latter, the bar was approached diagonally, and the jumper threw first the inside leg and then the other over the bar in a scissoring motion. Around the turn of the 20th century, techniques began to modernise, starting with the Irish-American Michael Sweeney's Eastern cut-off. By taking off like the scissors, but extending his back and flattening out over the bar, Sweeney achieved a more economic clearance and raised the world record to 6 feet 5.625 inches (1.97 m) in 1895.

Another American, George Horine, developed an even more efficient technique, the Western roll. In this style, the bar again is approached on a diagonal, but the inner leg is used for the take-off, while the outer leg is thrust up to lead the body sideways over the bar. Horine increased the world standard to 6 feet 7 inches (2.01 m) in 1912. His technique predominated through the Berlin Olympics of 1936, in which the event was won by Cornelius Johnson at 2.03 metres (6 ft 8 in).

American and Russian jumpers held the playing field for the next four decades, and they pioneered the evolution of the straddle technique. Straddle jumpers took off as in the Western roll, but rotated their (belly-down) torso around the bar, obtaining the most economical clearance up to that time. Straddle-jumper Charles Dumas broke the elusive 7 feet (2.13 m) barrier in 1956, and American John Thomas pushed the world mark to 2.23 metres (7 ft 4 in) in 1960. Valeriy Brumel took over the event for the next four years. The elegant Soviet jumper radically sped up his approach run, took the record up to 2.28 metres (7 ft 6 in), and won the Olympic gold medal in 1964, before a motorcycle accident ended his career

American coaches, including two-time NCAA champion Frank Costello of the University of Maryland, flocked to Russia to learn from Brumel and his coaches. However, it would be a solitary innovator at Oregon State University, Dick Fosbury, who would bring the high jump into the next century. Taking advantage of the raised, softer landing areas by then in use, Fosbury added a new twist to the outmoded Eastern Cut-off. He directed himself over the bar head and shoulders first, sliding over on his back and landing in a fashion which would likely have broken his neck in the old, sawdust landing pits. After he used this Fosbury flop to win the 1968 Olympic gold medal, the technique began to spread around the world, and soon floppers were dominating international high jump competitions. The last straddler to set a world record was Vladimir Yashchenko, who cleared 2.33 metres (7 ft 8 in) in 1977 and then 2.35 metres (7 ft 9 in) indoors in 1978.

Among renowned high jumpers following Fosbury's lead were: Americans Dwight Stones and his rival, 5 feet 8 inches (1.73 m) tall Franklin Jacobs of Paterson, NJ, who cleared 2.32 metres (7 ft 7 in), an astounding 0.59 metres (1 ft 11 in) over his head (a feat equaled by Sweden's Stefan Holm); Chinese record-setters Ni-chi Chin and Zhu Jianhua; Germans Gerd Wessig and Dietmar Mögenburg; Swedish Olympic medalist and world record holder Patrik Sjöberg; and female jumpers Iolanda Balaş of Romania, Ulrike Meyfarth of Germany and Italy's Sara Simeoni.

The approach of the high jump may actually be more important than the take off. If a high jumper runs with bad timing or without enough aggression, clearing a high bar becomes more of a challenge. The approach requires a certain shape or curve, the right amount of speed, and the correct number of strides. The approach angle is also critical for optimal height.

Most great straddle jumpers have a run at angles of about 30 to 40 degrees. The length of the run is determined by the speed of the person's approach. A slower run requires about 8 strides. However, a faster high jumper might need about 13 strides. A greater run speed allows a greater part of the body's forward momentum to be converted upward .

The J type approach, favored by Fosbury floppers, allows for horizontal speed, the ability to turn in the air (centripetal force), and good take-off position. The approach should be a hard controlled stride so that a person does not fall from creating an angle with speed. Athletes should run tall and lean from the ankles on the curve and not the hips . Unlike the "classic" straddle technique, where the take-off foot is "planted" in the same spot at every height, flop-style jumpers must adjust their take-off as the bar is raised. Their J approach run must be adjustly slightly so that their take-off spot is slightly further out from the bar in order to allow their hips to clear the bar while still maintaining enough momentum to carry their legs across the bar. Jumpers attempting to reach record heights commonly fail when most of their energy is directed into the vertical effort, and they brush the bar off the standards with the backs of their legs as they stall-out in mid-air.

Drills can be practiced to solidify the approach. One drill is to run in a straight line (the linear part of the approach) and then run two to three circles spiraling into one another. Another is to run or skip a circle of any size, two to three times in a row . It is important to train to leap upwards without first leaning into the bar, allowing the momentum of the J approach to carry the body across the bar.

src:wikipedia