More than a marathon
Running a marathon is a tough activity. At over 42 kilometres, it's a gruelling race.
But a marathon is like a walk in the park compared with South Africa's 'Comrades' race.
Comrades is an ultra marathon. Competitors have to complete a whopping 90 kilometre run.
The race was originally started to commemorate those who died in World War I.
Each year 12,000 competitors take part in a course which runs between Durban and Pietermaritzburg.
The winners often become national celebrities and the race has been a multi-racial event for decades.
Poppy Simpson was so intrigued by the race that she decided to follow some of the people taking part to find out their personal reasons for entering.
And - as she told Outlook's George Arney - she's turned her interviews into a film.
Andrew Kehele was the first black man to win the Comrades race.
The route covers 89 kilometres from Durban to Pietermaritzburg. This is the cityscape of Johannesburg.
Johnny has run the race 28 times. He's blind, and guided by his 'pilot', Moses.
Winners of the race become national celebrities in South Africa. These children in Soweto are taking part in the celebrations.