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Chi refers to metaphysical energy that flows throughout the body, or a 'life energy' that dwells inside every living being, connecting them to each other, their surroundings and the universe as a whole. It serves as the root of an individual's bending.

Ty Lee uses pressure points to immobilize her enemies by hitting them in a certain way. It is assumed the person loses the ability to use their muscles or have feeling in their arms, laving them unable to feel their 'life energy' or chi, and therefore unable to bend.