以下是一些包含“muscles”的例句：
He has developed strong muscles from years of weightlifting. 多年的举重锻炼使他的肌肉变得非常强壮。
She does yoga every morning to keep her muscles flexible. 她每天早上都做瑜伽以保持肌肉柔软。
After a long run, his muscles felt sore and tired. 长跑之后，他的肌肉感到酸痛和疲惫。
Weight training is essential for building and toning muscles. 重量训练对于建立和锻炼肌肉至关重要。
He flexed his muscles to show off his strength. 他展示肌肉以显示自己的力量。
She massaged her sore muscles after the intense workout. 高强度锻炼后，她按摩了自己酸痛的肌肉。
As he aged, he noticed his muscles becoming weaker and less defined. 随着年龄的增长，他发现自己的肌肉变得虚弱且不再分明。
The doctor advised him to rest his injured muscles for a few days. 医生建议他让受伤的肌肉休息几天。
She focused on exercises that would strengthen her core muscles. 她专注于能够增强核心肌肉群的锻炼。
His muscles bulged as he lifted the heavy weight. 当他举起重物时，肌肉凸显了出来。
这些例句展示了“muscles”在不同语境中的用法，包括锻炼、疼痛、展示力量等方面。
