It looks like a marathon...
But strong legs are just one of the requirements to succeed in the Strongman Run.
About 11,000 competitors scramble over mud and slide on water. Fancy dress is optional.
The athletes even give each other a helping hand around the 23km Nurburgring racetrack in Germany.
This year's winner did it in just over an hour and a half.
fancy dress 奇裝異服