Jessica Ennis-Hill of Great Britain competes in the Women's Heptathlon Javelin Throw on Day 8 of the Rio 2016 Olympic Games at the Olympic Stadium on August 13, 2016 in Rio de Janeiro, Brazil.

Jessica Ennis-Hill of Great Britain, Antoinette Nana Djimou Ida of France, Katerina Cachova of the Czech Republic and Nadine Visser of the Netherlands compete in the Women's Heptathlon 100 Meter Hurdles on Day 7 of the Rio 2016 Olympic Games at the Olympic Stadium on August 12, 2016 in Rio de Janeiro, Brazil.

Jessica Ennis-Hill of Great Britain reacts in the Women's Heptathlon Javelin Throw on Day 8 of the Rio 2016 Olympic Games at the Olympic Stadium on August 13, 2016 in Rio de Janeiro, Brazil.

London 2012 - Jessica Ennis of Team GB under close scrutiny as she competes in the heptathlon shot put round.

London 2012 - Jessica Ennis on her way to winning heptathlon gold in the Olympic stadium before ecstatic Team GB fans.

London 2012 - the flag says it all: Team GB heptathlete Jessica Ennis is an Olympic champion.

London 2012 - Team GB's gold medal-winning heptathlete Jessica Ennis competes in the javelin throw.

London 2012 - Jessica Ennis of Great Britain prepares for a javelin throw during the heptathlon competition at the Olympic stadium.

London 2012 - Jessica Ennis of Great Britain lights up the Olympic stadium with her smile as she takes gold in the heptathlon.

London 2012 - after losing her heptathlon world title to Russia's Tatyana Chernova last year, British heptathlete Jessica Ennis remodelled her javelin technique and reset her personal best on the way to winning Olympic gold.