The Clacker is an obstacle, firstly appeared as the ninth obstacle in Atlanta finals on American Ninja Warrior 8. This obstacle is 20 feet long and has ten clackers in total four on the left and six on the right. There, competitors must grab two clackers that are sitting on a ledge and bring it up and over to the other side of the ledge, from there transitioning to another set of clackers. After the second set of clackers, the contestant can only use one side, which is at the middle. These clackers alternate in length, either 14 and 16 inches long. From the middle, competitors must once again transitioned to another pair of clackers. There are two sets, but if they want to, competitors can dismount after the first set. Seven competitors reached this obstacle. Ultimately, Travis Rosen, Brett Sims, James McGrath, and Drew Drechsel were the only four competitors to finish the course. Three competitors came very close to finishing this obstacle (Casey Suchocki, Jo Jo Bynum, and Shawn Richardson).
The Clacker returned as the ninth obstacle in Cleveland finals on American Ninja Warrior 9. Due to brutality from the previous obstacle (the Nail Clipper), only Jamie Rahn and Joe Moravsky could reach this obstacle, and they both completed it.
- The idea of this obstacle came from a wooden ratchet instrument.
- The name came from the clacking sound that the wooden ratchet makes.
- The original concept were first started out as right-arm and left-arm movements and then windshield wiper movements were added to one side in the middle to make it harder.