Why Didrik never has been injured

Didrik Hermansen, who´s in the top of the international ultra running league and awarded as the best runner in Norway for the third year in a row, works day time as a napraprath. He has never been injured due to running. He runs 150 - 220 km every week, most of them on easy pace and he exersises three times a week with this foam roller. He beleives this prevents injury and helps him recover fast.