Agonist and antagonist muscles often occur in antagonistic pairs – When the muscle that creates movement (agonist) contracts, its opposite muscle (antagonist) relaxes. Antagonistic muscles always work in synergy: when one of the muscles contracts, the other relaxes. The most common example of antagonistic muscles are the biceps and the triceps. As the agonist muscle contracts, the antagonist relaxes, helping to manage and regulate the movement of the former.
