Train like a Ninja! The patented Slackers Ninjaline (ninja line) from B4Adventure incorporates elements from the popular television series to create a unique set of challenges for kids and adults. With input from professional Ninja’s, the Slackers Ninjaline offers versatility to create a variety of course set ups ranging from beginner to advanced. Simply hang the NinjaLine between two healthy trees and you are ready to go. The line includes a carrying bag for easy portability between the backyard and the park or to a friend’s house.