Editing High jump (section)

===Takeoff===
The takeoff can be double-arm or single-arm. In both cases, the plant foot should be the foot farthest from the bar, angled towards the opposite back corner of the mat, as they drive up the knee on their non-takeoff leg. This is accompanied by a one- or two-arm swing while driving the knee.

Unlike the straddle technique, where the takeoff foot is "planted" in the same spot regardless of the height of the bar, flop-style jumpers must adjust their approach run as the bar is raised so that their takeoff spot is slightly farther out from the bar. Jumpers attempting to reach record heights commonly fail when most of their energy is directed into the vertical effort and they knock the bar off the standards with the backs of their legs as they stall.

An effective approach shape can be derived from physics. For example, the rate of backward spin required as the jumper crosses the bar in order to facilitate shoulder clearance on the way up and foot clearance on the way down can be determined by computer simulation. This rotation rate can be back-calculated to determine the required angle of lean away from the bar at the moment of planting, based on how long the jumper is on the takeoff foot. This information, together with the jumper's speed, can be used to calculate the radius of the curved part of the approach. One can also work in the opposite direction by assuming a certain approach radius and determining the resulting backward rotation.
 
Drills can be practiced to solidify the approach. One drill is to run in a straight line 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.<ref>{{cite web|url=http://www.everythingtrackandfield.com/catalog/matriarch/OnePiecePage.asp_Q_PageID_E_307_A_PageName_E_ArticleGirouxHighJump|title=High Jump Technique and Training|url-status=dead|archive-url=https://web.archive.org/web/20081123042035/http://www.everythingtrackandfield.com/catalog/matriarch/OnePiecePage.asp_Q_PageID_E_307_A_PageName_E_ArticleGirouxHighJump|archive-date=November 23, 2008|access-date=2009-02-11|df=mdy-all}}</ref> It is important to leap upwards without first leaning into the bar, allowing the momentum of the '''J''' approach to carry the body across the bar.