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The triceps muscle group is primarily opposed by the biceps. The triceps are located on the back of the upper arm and are responsible for elbow extension, which occurs when you straighten the arm. In contrast, the biceps are situated on the front of the upper arm and are responsible for elbow flexion, which involves bending the arm at the elbow.

When performing movements that involve flexing the arm, such as curling a weight, the biceps contract while the triceps relax; this opposing action is essential for balance and coordination in upper body movements. Understanding the relationship between opposing muscle groups, often referred to as antagonistic muscle pairs, is fundamental for personal trainers when designing effective exercise programs. In this case, the biceps' role as the antagonist to the triceps highlights their importance in opposing movements during activities that require elbow flexion and extension.