Just a few years ago, Dennis Kimetto was working on his family's farm in Kenya's Rift Valley highlands, growing potatoes, maize and taking care of livestock.
He would watch from the fields as groups of runners sped by in their pursuit of international stardom, before an opening with a local training group set him on a course that saw him smash the marathon world record and become the first man to break the 2hrs 03min barrier last week.
"I used to watch a lot of athletics on television, I was inspired," he told AFP, hours after returning home from Berlin to a hero's welcome.
Family hardship meant Kimetto had to drop out of school at 14 to help on the farm and at the local market, but he eventually struck up a conversation with Geoffrey Mutai — already one of the world's fastest road racers.
"I was invited to join the athletics training camp at Kapngetuny, which is only a few kilometres from my home," the quietly-spoken 30-year-old recalled. Through running with Mutai's group he gained access to running kit and shoes, which cost a small fortune in Kenya, and an overseas manager and agent.
Long-inspired by Ethiopian Haile Gebrselassie and Kenyan Paul Tergat's epic 10,000M duel at the 2000 Sydney Olympics, Kimetto threw himself into the group training regimen that — when coupled with their unique physiology — puts Kenya's runners on a level above the rest.
Living in humble dormitories, eating simple food — Kimetto recommends plenty of fruit, vegetables, fermented milk and ugali, the local maize-flour mash — and running huge training volumes of close to 250 kilometres (160 miles) a week, his talent soon became evident.
His first major win came in Nairobi's Half Marathon in 2011, and he went on to finish second behind mentor Mutai in the Berlin Marathon in 2012 — his 2:04.16 was the fastest debut in history.
Kimetto's performance was also notable because he represented a new breed of Kenyan road racers — who one coach has described as "turbo diesels" — who have no track pedigree, modest top-end speed yet have the speed endurance to excel on the roads.
In 2013 he won the Tokyo Marathon, setting a course record of 2:06.50, and then the 2013 Chicago Marathon, where he set another course record of 2:03.45.Last Sunday, on the fast-and-flat Berlin course, he raised the bar even higher, taking 26 seconds off the marathon world record of his neighbour and training partner Wilson Kipsang.
His 2:02.57 also made him the first man to break the 2:03 barrier, and has again prompted fresh debate over whether a sub-2 hour marathon may one day be possible.
"I didn't expect to run a new world record when we started the race. But at the 21km mark I realised it was possible and we urged the pacemakers to increase the pace," he said.
"It was a matter of endurance under much internal pain. It was physically painful, and we have to push hard to persevere, or 'kuvumilia' as we say in Swahili. But when I heard the crowd cheering me on I was able to keep pushing myself."A half-dozen runners followed pacesetters to the halfway point in 1:01:45. Emmanuel Mutai reached 30 kilometers in 1:27:37, a record for the distance. He surged to try to break Kimetto and another Kenyan, Geoffrey Kamworor.
By 35 kilometers Kamworor, who would finish fourth, had drifted off the pace. It was left to Kimetto and Mutai to settle the race and the world record.
Kimetto began to draw away slightly. At 40 kilometers, his lead expanded to seven seconds. In April, Kimetto dropped out late during the Boston Marathon because of a hamstring injury. There was no such disruption this time. Kimetto ran through the Brandenburg Gate in Berlin and maintained his speed to set a world record and break the 2:03 barrier.
The race netted him $154,000 (122,000 euros), not including appearance fees or bonuses from sponsors. He is also well-placed to win the World Marathon Majors title for 2013-2014, which would earn him another $500,000.
His winnings, he said, will be ploughed back into school and college fees for young family members, and support for his community and training group -- all keeping with the runners' tradition of 'Harambee', or pulling together. Kimetto only smiled when asked about breaking the two-hour barrier, but said he thinks he can still go faster.
"I'm going to run harder. I'm going to run faster. I'll take a short break, but in the new year I'll train with my fellow runners to try and break my own record."
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