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He's the marathon world record holder and the only man to have run the distance - albeit unofficially - in under two hours but not until he defended his Olympic title in September did Eliud Kipchoge believe he had secured his sporting legacy.
The 37-year-old clearly has far higher standards than most of the sporting public, many of whom already considered the Kenyan to be the greatest male marathoner in history.
Quite aside from his long list of successes, his win in Sapporo, Japan, saw him join an elite group of runners, becoming just the third person to retain an Olympic marathon title.
Only legendary Ethiopian runner Abebe Bikila in the 1960s and East Germany's Waldemar Cierpinski, in 1976 and 1980, have managed the same feat as Kipchoge, a nominee for BBC African Sports Personality of the Year.
"It was my best moment to win the gold in Olympics back-to-back," Kipchoge told BBC Sport Africa. "I've done a lot, but the Tokyo 2020 gold cemented everything. It cemented what I've been doing."
His victory - achieved with the biggest winning margin in the men's Olympic marathon in five decades - was so impressive it persuaded the International Olympic Committee to select Kipchoge as their male athlete of the Games.
The fact the Olympics was staged at all tapped into a central theme of Kipchoge's character, namely the belief that anything is possible.
"It was really crucial to give us hope and tell everybody that as human beings, luckily we have enough knowledge and power to overcome any uncertainty," he said.
It's hardly a surprise Kipchoge is so keen on breaking new ground, as it has been a prominent feature of his career.
