Leave out one of the sequences and you are grounded. Persistence is learned. You don't get to your intended target without keeping with the program. No need for the instructor to tell the new climber about persistence because it will be apparent. If you stop moving the knots up, you cease to climb.
Persistence is learned in an atmosphere of excitement as opposed to a judgmental environment.
Reaching a goal is experienced. Sometimes a bell is hung to ring or the climber might find a small bottle of bubbles to blow on those below. The main point is a recognizable goal was achieved and that brings a mountain of satisfaction to the climber involved, be they kid or adult. Group support is fostered. A large tree will usually support ten climbing stations.