Four years after being inspired by compatriot Jessica Ennis-Hills London 2012 gold, Katarina Johnson-Thompson wants to become Great Britains new queen of the heptathlon.Ennis Hills quest for back-to-back Olympic golds begins in Rio on Friday when Liverpudlian Johnson-Thompson, 23, is also expected to challenge for a medal.In the London Games, Johnson-Thompson, then a teenager, secured a top-15 finish and was among those admiring Ennis-Hills achievement as she celebrated being part of Super Saturday on a gold-laden day on home soil for British track and field.While Ennis-Hills victory then was a source of motivation for Johnson-Thompson, she now wants to emulate her by fulfilling her own Olympic aspirations.She has inspired me ever since London so that is what I want to do now -- to win an Olympic gold, she told the Press Association.Hopefully thats what I can do now. I think everyone has to aim for gold but Im not going to be disappointed if I just get a medal, its an Olympic medal.Last summer the two flirted with a rivalry at a major competition, with Johnson-Thompson second behind Ennis-Hill after four events at the World Championships in Beijing before she failed to register a legal attempt in the long jump at the start of the second day and fell away.Her desire to reach her sports peak has not abated and she insists only success in Rio will see her smiling at the end of the competition.Speaking about how far she has come in four years, Johnson-Thompson added: Its completely different, last year was the first time Id competed outside of Europe.Im four years older, I think thats four years wiser, though Im not too sure! At 19 I was just lucky to be there in London. The experience was what it was about whereas this time Im trying to hopefully get a medal. Im a lot more focused and not as happy because the job isnt done yet.Johnson-Thompson has spent the bulk of her preparation time working on her shot put and javelin, her two self-confessed weaker disciplines, which are split across the two days in Brazil.The haunting memories of how it unravelled on the second day in China may not be far from her mind if she is in a dominant position after the first four events, though Johnson-Thompson is not expecting a comfortable evening wherever she stands after the first day.No matter what happens, its not going to be an easy nights sleep, its not done after one day, she stressed. Its not feet up and kick back, its going to be a tough time no matter what.At 30, Ennis-Hill has already stated she will not continue beyond the 2017 World Championships in London and Johnson-Thompson has revealed she has her own potential swansong in mind.She was recently named as one of the ambassadors of her home citys bid to host the Commonwealth Games in 2026 and, though she would be 33, she insists she wants to be competing were the event to be staged in Liverpool.Ill be coming towards the end of my career so that would be a nice send-off, even if its just a single event. she said.Ennis-Hill, meanwhile, admits it would be incredible to be part of a repeat of Super Saturday at the Rio Olympics.The culmination of the heptathlon comes on Saturday, when Mo Farah and Greg Rutherford will also go for gold in the 10,000 metres and long jump respectively.Four years ago in London the trio gave British athletics its finest hour, all three celebrating victory on home soil, to the delight of a frenzied crowd, within the space of a barely-believable 45 minutes.The timetable this time means the medals cannot be won in quite such a short space of time, but there remains a strong chance of another momentous day.It is really exciting. 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