Emmanuel Eseme is not your usual world-class sprinter.
A former amateur footballer who played in goal, the Cameroonian did not switch to athletics until he was 24.
Now 32, he has spent most of the intervening years balancing sprinting with his job as an environmental engineer.
He is currently based in Portugal having joined Sporting CP, most famous for its illustrious football team but a multi-sport club which Eseme represents in meetings wearing its famous green and white striped kit.
He has even adopted the celebration of one of its former players, copying the mask made by Viktor Gyokeres,, external which sees the Arsenal striker cover his mouth with interlocking fingers after he scores.
"I liked the way he played. He was strong, very determined," Eseme told BBC Sport Africa.
"I didn't know the meaning of his mask, but then I decided to give a meaning.
"[It] looks similar to the pirate mask. And when pirates go somewhere they change the happenings of everything, and I believe that's what I'm doing in athletics.
"I'm going there as that pirate, that game changer."
Eseme was "really happy" to receive a video message from Gyokeres, external congratulating him on qualifying for last year's Olympics in Paris.
"It just motivated me to keep on going harder," he added. "To be able to represent the mask."
With Eseme currently preparing to represent his nation in both the 100m and 200m at his third World Athletics Championships in Tokyo, he is hoping his achievements - which have made him a household name in Cameroon - can be a game changer for athletics in his homeland.