Final answer:
The bellybutton rule when working on ladders is to not let your bellybutton go beyond the side rails. This helps ensure proper balance and stability while working at height.
Step-by-step explanation:
The bellybutton rule when working on ladders is to not let your bellybutton go beyond the side rails.
This means that when you are climbing up or down a ladder, you should always keep your bellybutton within the boundaries of the ladder's side rails.
This helps ensure proper balance and stability while working at height.