

Long-distance runners do speed work on a dirt track in Iten, Kenya. It's far from the high-tech all-weather tracks common throughout Europe and the United States, but Kenya is where the elite distance runners are. Brendan Bannon/Polaris
Coach Renato Canova monitors times from a pace car during a training run outside the high altitude town of Iten, Kenya.
Athletes training with elite Kenyan runner Wilson Kipsang, winner of the 2012 London Marathon, dash through the outskirts of Iten on a morning run. Brendan Bannon/Polaris
Yoann Kowal, a French 1500-meter specialist, gets a massage at Iten’s Kerio View Hotel. Kowal has trained extensively at the high-altitude (8,000 feet) Kenyan village. Brendan Bannon/Polaris
Car headlights show the way for a runner. A distance runner’s training day might begin with an 11-mile run. Brendan Bannon/Polaris
Ioannis Magkriotellis (l.), a Greek marathoner, trains with Kenyan Johana Kariankei, in hopes of improving his time to make the Greek Olympic squad. The London Games are this summer. Brendan Bannon/Polaris
Donald Wambau and Purity Nathan sell used running shoes to athletes in Iten. The shoes, imported from Europe and the United States, sell for a fraction of their original price. Brendan Bannon/Polaris
2012 London Marathon winner and Kenyan Olympic marathon team member Wilson Kipsang checks his phone while Abel Kirui waits for a massage in the 'Physio' room of the Demadonna camp in Iten, Kenya. Brendan Bannon/Polaris
Two-time world champion marathoner Abel Kirui rests after a training session near Eldoret, Kenya. Brendan Bannon/Polaris
Wilson Kipsang (in blue) starts the morning run with a group of fellow athletes. Young unknowns train beside world-class runners like Kipsang in this high-altitude town. Brendan Bannon/Polaris
Mary Keitany, who currently claims the third-fastest women's marathon time ever, poses in her home in Iten, Kenya. Brendan Bannon/Polaris
The Iten home of 2011 and 2012 London Marathon winner Ms. Keitany is festooned with medals and mementoes of past races. Brendan Bannon/Polaris
Mary Keitany, running with her pace-setter, Justus Kipkogei, crosses paths with other runners in town. Brendan Bannon/Polaris
Johana Kariankei, 20, can run a half marathon in 64 minutes and hopes to compete in Europe someday. To pay expenses, he sells the Masai bead necklaces and bracelets he makes. He is a Masai. Brendan Bannon/Polaris
A Kenyan schoolboy runs to school on a dirt road in Iten, Kenya. Brendan Bannon/Polaris
Elite Kenya woman marathon runner Florence Kiplagat and her pace-setters, Simon Kosgei and Shadrack Maiyo, pause before a training run outside Eldoret, Kenya. Brendan Bannon/Polaris