The modern Summer
Olympic Games have been held every four years since the first Games in
1896 and
Olympic records are recognised by the
International Olympic Committee (IOC) in each event. The
athletics events, which take place at each Games, are divided into four groups:
track events (including sprints, middle- and long-distance running, hurdling and relays),
field events (including javelin, discus, hammer, pole vault, long and triple jumps), road events (such as walks and the marathon) and combined events (the heptathlon and the decathlon). Women compete in 23 athletics events during the Games, and men compete in 24; while 21 of the events are the same for both men and women, men exclusively compete in the 50 km walk, the women's combined event is the heptathlon while the men compete in the decathlon, and the short distance hurdles for women is contested over 100 m, ten metres shorter than the men's event.