A race where the runners jump over something is called a hurdle. There can be short and long hurdles.
Runners jump obstacles in the following races: Women's 100m hurdles Men's 110m hurdles 400m hurdles 3000m steeplechase
60 meter hurdles 100 meter hurdles (Woman) 110 meter hurdles (Men) 400 meter hurdles
there is 12 runners in an olympic relay race
All the runners were ready for the race.
A relay race.
There are only a few requirements in an obstacle course race. They have to be challenging and they have to be a series of events to complete. Obstacle courses are usually timed but not always.