Piston Road was the first obstacle in American Ninja Warrior 6 . It consisted of six slightly tilted cylinders. Competitors would have to jump from one piston to the other. This obstacle proved to be very easy, as all 100 competitors passed it and nobody failed it. It took out its first 4 victims in American Ninja Warrior 7 when Steve Martin fell on it, as well as Dennis Lappin, Caitlin Shukwit and Annie Dudek, though their runs were not shown. Even then, it still had a very low 4% knockout rate. It was replaced by the Snake Run in American Ninja Warrior 8.