strengthen

日常锻炼有助于增强你的肌肉。

Daily exercise helps to ___strengthen your muscles.

定期锻炼可以增强你的腿部肌肉。

Regular exercises can ___strengthen your leg muscles.

医生推荐特定的练习来加强膝盖周围的肌肉。

Doctors recommend specific exercises to ___strengthen the muscles around the knee.