这些锻炼能增强肌肉并提高耐力。

These exercises build ___muscle and increase stamina.

它锻炼这个区域的肌肉，为我们提供耐力和健康。

It tones the ___muscles in this area and provides us with stamina and good health.

微笑会用到许多面部肌肉。

Smiling uses many facial ___muscles.