Kenya’s Asbel Kiprop: “The nightmare has continued. I insist I am innocent even if I am forsaken.” Photograph: Getty Images

Asbel Kiprop has suggested he tested positive for EPO because drug control officers tampered with his sample, having also demanded money from the Keny(...)

Athletes in action during the IAAF Men’s World Half Marathon Championships  in Valencia. Photograph: Miguel Angel Polo/EPA

Running is the most popular sport in the world. More people run than partake in any other sport, and more people participate in running events – even (...)