Good characteristics of a hurdler include height, great sprinting ability and good form.
Younger athletes run shorter distances and have smaller and fewer hurdles.
Older athletes have longer distances, higher and more hurdles to jump. Males 14-17 may run 100 meters, jump 10 hurdles at a height of.762 or run 110 meters, jump 10 hurdles at a height of .914 or .990. Females aged 14-17 run 80 meters and jump 8 hurdles at a height of .762. Also, the 400 meter race has many variations as well as to number and height of hurdles. The specifications really depend on the league or competition's requirements.