The State of Running 2019 study carried out by athletic shoe review site Run Repeat and the International Association of Athletics Federations (IAAF), analysed some 107.9 million race results from over 70,000 events.
The State of Running 2019 study carried out by athletic shoe review site Run Repeat and the International Association of Athletics Federations (IAAF), analysed some 107.9 million race results from over 70,000 events.