The attachment of the muscle that is more movable is the muscle:

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The muscle insertion is where the muscle ends.This is the more movable attachment,or portion of the muscle that is away from the midline of the body.
Muscles are arranged in opposing pairs so that one can contract and the other can relax.This action makes motion possible.The place where the muscle is more fixed or nearer the midline of the body is called the origin.
Contraction is the tightening of a muscle.Relaxation occurs when a muscle returns to its original form or shape.

The Attachment of the Muscle That Is More Movable Is