The Slack Ladder is an obstacle, firstly introduced as the third obstacle on American Ninja Warrior 6 in Venice Beach.
Competitors must walk across 18 feet nylon-made ladder, with four rungs to step on. They could either walk on the sides of the ladder, or walk on the rungs of the ladder, in similar fashion to the Bungee Bridge.
However, unlike the Bungee Bridge, competitors were not allowed to touch the obstacle with their hands. If they did so, they would be disqualified.