Antagonistic (an·tag·o·nis·tic) n – Antagonist and Agonist muscles often occur in pairs, called antagonistic pairs. As one muscle contracts, the other relaxes. An example of an antagonisic pair is the biceps (flexor) and triceps (extendor); to contract – the triceps relaxes while the biceps contracts to lift the arm.
Agonist ag·o·nist (āg’ə-nĭst) n – muscles cause a movement to occur through their own contraction.
Antagonist (an-tag-uh-nist) n – muscles oppose a specific movement.
Flexor & Extensor according to en.wikipedia.org/wiki/
Flexor (flek’sŏr) ta: Muscles that decreasing the angle.
Extensor (eks-ten’sŏr, -sōr), ta: Muscles that open/straight the angle of the joint.
For this reason, focus on a balanced workout:
| Agonist | Antagonist |
|---|---|
| Biceps | Triceps |
| Deltoids | Latissims Dorsi |
| Pectoralis Major | Trapezius/Rhomboids |
| Rectus Abdominis | Erector Spinae |
| Iliopsoas | Gluteus Maximus |
| Quadriceps | Hamstrings |
| Hip Adductor | Gluteus Medius |
| Tibialis Anterior | Gastroncnemius |
Information according to: medical-dictionary.thefreedictionary.com