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Inversion specifically refers to the movement of the bottom of the foot turning inward toward the midline of the body. This movement occurs at the subtalar and ankle joints and is commonly seen in activities like walking or running, especially when the foot's position changes from an upright stance to various actions like cutting or pivoting.

When the foot inverts, the lateral aspect (outer side) of the foot is raised while the medial aspect (inner side) moves downward, which can contribute to balance and stability during movement. Understanding this anatomical term is crucial for personal trainers as they design programs that enhance functional movements and prevent injuries related to ankle stability.

The other options describe different movements. For instance, the movement of the foot outward refers to eversion, which is the opposite of inversion. Pushing off involves a combination of motions, but it does not specifically denote the inward movement associated with inversion.