agonist

When you bend your elbow, the biceps acts as the agonist and the triceps relaxes.

当你弯曲肘部时，肱二头肌充当主动肌，肱三头肌则放松。

During a squat, the glutes are the main agonists that drive the movement.

下蹲时，臀肌是带动动作的主要主动肌。

The physical therapist asked me to identify the agonists in each leg exercise.

理疗师让我指出每项腿部练习中的主动肌。