Final answer:
Muscles that are concerned with bracing actions are called fixators. These muscles stabilize the bone that is the attachment for the prime mover's origin.
Step-by-step explanation:
Muscles that are concerned with bracing actions are called fixators. These muscles stabilize the bone that is the attachment for the prime mover's origin. For example, when lifting a heavy object, the muscles in your core act as fixators to stabilize your spine while the prime mover muscles in your legs do the lifting.