Competitors must across 6 angled piston-shaped steps (in a similar fashion with the Godantobi or Rokudantobi). This obstacle was proven to be extremely easy, as all 90 competitors could complete the obstacle.
The Piston Road returned on American Ninja Warrior 7, once again as the first obstacle in Stage One. This time, the obstacle took out 4 competitors (Steve Martin, Dennis Lappin, Caitlin Shukwit and Annie Dudek). Despite that, it still had a very low 4% knockout rate.