How do muscles move in pairs scientific explanation?

Muscles move in pairs through a mechanism known as antagonistic muscle action. When one muscle, called the agonist, contracts to produce movement, its opposing muscle, the antagonist, relaxes to allow that movement to occur. For example, in the arm, when the biceps contract to flex the elbow, the triceps relax. This coordinated action ensures smooth and controlled movements, maintaining balance and stability in the body.