Ennis is an English and British track and field athlete specialising in multi-eventing disciplines and 100 metres hurdles. A member of the City of Sheffield Athletic Club, she is the current Olympic heptathlon champion. She is also the former European and world heptathlon champion and the former world indoor pentathlon champion. She has been the British national record holder for the heptathlon, the indoor pentathlon, the high jump and the 100 metres hurdles.