Training
Most of these Kalenjin runners have been training hard over the years to earn the endurance and physical ability to outlast other runners.
One of the most famous training areas in Kenya is Iten, where British athletes like Mo Farah and Paula Radcliffe train before competitions.
The most important aspect of training includes understanding the body to learn when to slow down and speed up.
Some athletes, like Kipchoge, log in their training every day as they prepare for marathons, and it shows how hard they push their bodies to achieve world success.