Hurdling
Height and spacing

There are five hurdle heights on most standard hurdles. The highest position (sometimes "college high" or "open high") is used for men's sprint hurdle races (60 m, and 110 m), which are 42 inches (106.7 cm). The next highest, (sometimes "high school high") 39 inches (99.1 cm) is used by veteran men under age 50, and younger boys. The middle position of 36 inches (91.44 cm), (sometimes "intermediate") which is used for men's long hurdle races (400 m) plus some youth and veteran age divisions. The next lower position, 33 inches (83.8 cm) is called the "women's high" used for women's short hurdle races. The lowest position, called the "low hurdle" 30 inches (76.2 cm) is used for women's long hurdles plus many youth and veteran races. Some races call for 27 inches or 68.6 centimetres for youth or veteran events. Hurdles that go to this position are rare and are notable by having a sixth position.

In sprint hurdle races for men, regardless of the length of the race, the first hurdle is 13.72 m (45 ft) from the starting line and the distance between hurdles is 9.14 m (30 ft). In sprint hurdle races for women, the first hurdle is 13 m (42 ft 8 in) from the starting line and the distance between hurdles is 8.5 m (27 ft 11 in). In long hurdle events, whether for men or women, the first hurdle is 45 m (147 ft 8 in) from the starting line and the distance between hurdles is 35 m (114 ft 10 in). Most races which are shorter than the standard distance (such as indoor races) are simply run over fewer hurdles but use the same distances from the starting line. There are variations on hurdle height and spacing for the age groups of athletes competing. See Masters athletics (track and field) and Youth athletics.
detectable_content:postscript, change_case:english_capital