They say that behind every great man is a great woman. Well, behind 400m world record-breaker Wayde van Niekerk is a great-grandmother.
The South African, who won gold in stunning fashion in Rio by breaking Michael Johnson's 17-year-old record, is trained by Ans Botha, a 74-year-old great grandmother who coaches at the University of the Free State.
She told City Press last year: "I'm very blessed because I don't have any health problems, and it is because I'm busy with young people - and you have to be high up there with them."
She's known as 'Tannie Ans' - Tannie meaning 'auntie' in Afrikaans - by those who work with her and apparently has a no-nonsense approach.
It certainly seems to be working - 23-year-old Van Niekerk stunned the world with a time of 43.03 seconds in Rio.
Having never coached an athlete who has reached the highest level of the sport before, the experience is new for Botha - who herself was a sprinter and long jumper when she was younger.
She told City Press: "I wouldn't say I'm afraid... But I have such a big responsibility to get this athlete to develop to his full potential. Also, I need to try to do my very best not to do something wrong that might break him."
Pretty sure we can say she's succeeded.