Jamaica's Usain Bolt and Ethiopian distance runner Almaz Ayana have been crowned as the IAAF's athletes of the year.
Bolt completed his amazing Olympic "triple triple" of 100metres, 200metres and 4x100m relay golds at the Rio Games in August despite missing much of the season through injury and took the award for the sixth time.
He clocked season's bests of 9.81 and 19.78 to win the 100m and 200m in Rio and then anchored the Jamaican team to a world-leading 37.27 when winning the 4x100m.
He also went undefeated throughout the whole season at all distances, including heats.
Bolt, 30, plans to run the 100m at next year's world championships in London, seeking to add to his haul of 11 world titles.
Ayana produced a stunning run on the first day of athletics in Rio when she shattered the 10,000-metres world record that had stood for 23 years.
Her time of 29 minutes, 17.45 seconds smashed the mark of 29:31.78 that was set by Wang Junxia of China in 1993.
Ayana also took bronze in the Rio 5000m, her only loss of the year over the distance. She ended the year as the Diamond Race winner for that discipline.
She becomes the third Ethiopian woman to win the IAAF award, following Genzebe Dibaba in 2015 and Meseret Defar in 2007.
Looking back at his astonishing career, Usain Bolt said his only real regret was not taking his sport more seriously at an earlier age.
"Maybe I would have been at four Olympics," the superstar Jamaican sprinter said.
"The award is definitely a big deal, it proves all the hard work has paid off," he said after Olympic 10,000 metres champion and world record holder Almaz Ayana of Ethiopia took the women's equivalent.
"The fans helped vote for this and it's for the fans I keep doing it."
With nine Olympic golds in the drawer, Bolt plans to hang up his spikes next year after a farewell tour of his favourite venues.
He will run the 100 metres only before competing at the world championships in London where he will be gunning for his 12th and 13th world titles if he goes in the relay.
"When I look back the only real thing I think I would change was to have got more serious more quickly," said Bolt.
"I was relying more on my talent. If I'd got more serious I think I would have done a lot more in my career. It's shocking but it's true. Maybe if I'd started younger I'd have had four Olympics."
Despite his multiple titles and world records, Bolt said the race that would always have a particular place in his heart was the world junior championships in his home country when he won the 200 as a 15-year-old.
"That was special," he said. "That was the beginning. Jamaica 2002, where it all began. That was the biggest step."
However, it was a defeat five years later that made the biggest impact.
Bolt took the 200 silver behind American Tyson Gay at the 2007 Osaka world championships and it was a real wake-up call.
"After I lost I remember going to my coach saying, 'I really tried my best but what can I do to win because I really need to win?'," Bolt explained.
"He said: 'You're slacking off in the gym. If you want to win you have to get stronger.' So I was like 'alright'. I knew what I needed to do and from then I took the step and just worked and worked."
Within nine months Bolt was the 100 world record holder and weeks later blasted himself into worldwide consciousness by winning the 100 and 200 and 4x100 relay at the Beijing Olympics in spectacular style.
Having found a way to win he was in no mood to stop, repeating the feat at London 2012 and, despite early season injuries, doing it again in Rio.
Now 30 and with his speediest days behind him, Bolt is trimming his workrate to enjoy one last season, running a series of 100 races only.
"Next year is mainly for the fans," said Bolt who always gives up a huge amount of time to sign autographs and pose for photos every time he races.
"It's a last opportunity for some people to see me run and a chance for me to say goodbye. I'd like to go back to some of my favourite places to run, Ostrava, Lausanne, maybe Paris."
And then that will be it. The man who has carried his troubled sport, sometimes single-handed, for a decade will step aside for the next generation.
There will be no Michael Phelps-style comeback at the 2020 Tokyo Olympics either.
"Oh no," he said. "My coach said, 'Do not retire and come back, don't ever do that'.
"It's a bit different for swimming but for most track and field athletes it never goes well.
"I'm still talking to people about what I will do afterwards and I definitely want to stay involved in the sport but at the moment I am just looking forward to doing nothing," said Bolt.