Editing Sprint (running) (section)

===The start===
[[File:Start Jeremy Wariner 2007.jpg|thumb|[[Jeremy Wariner]] beginning a race from the starting blocks]]
[[Starting blocks]] are used for all competition sprints (up to and including 400&nbsp;m) and relay events (first leg only, up to 4x400&nbsp;m).<ref name=IAAF>[http://www.iaaf.org/download/download?filename=7c4c7e46-8979-453d-a355-a736fdac2281.pdf&urlslug=Competition%20Rules%202012-13 Competition Rules 2012-13], IAAF</ref> The starting blocks consist of two adjustable footplates attached to a rigid frame. Races commence with the firing of the [[Starting pistol|starter's gun]].<ref name=IAAF /> The starting commands are "On your marks" and "Set".<ref name=IAAF /> Once all athletes are in the set position, the starter's gun is fired, officially starting the race. For the 100&nbsp;m, all competitors are lined up side by side. For the 200&nbsp;m, 300&nbsp;m, and 400&nbsp;m, which involve curves, runners are staggered for the start.

In the rare event that there are technical issues with a start, a green card is shown to all the athletes. The green card carries no penalty. If an athlete is unhappy with track conditions after the "on your marks" command is given, the athlete must raise a hand before the "set" command and provide the Start referee with a reason. It is then up to the Start referee to decide if the reason is valid. If the Start referee deems the reason invalid, a yellow card (warning) is issued to that particular athlete. If the athlete is already on a warning, the athlete is disqualified.