muscle|muscles

这些锻炼能增强肌肉并提高耐力。

These exercises build ___muscle and increase stamina.

强健的颈部肌肉对良好姿势很重要。

Strong neck ___muscles are important for good posture.

定期锻炼能强健肌肉并改善健康。

Regular exercise tones the ___muscles and improves health.