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Injuries, overheating, illness; it can all happen to you when you run a marathon. But at the same time, running also has many positive effects. How unhealthy is it to run a marathon? We found out. Do you want to see more videos and not miss anything? Then subscribe to our channel! ---------------------------------------------------------------------------------------- ► QUESTIONS/TIPS/IDEAS? Let us know in the comments what you think of NOS Sport! / nossport ► FOLLOW US: Instagram: www.instagram.com/nossport/ Twitter: @NOSSport Facebook: www.facebook.com/nossport