健身操的一种aerobics(plural)

• 记者感觉演员们与其说在跳舞，不如说在跳有氧操更合适。

  This reporter feels that rather than saying the performers are dancing, it is more appropriate to say that they are doing aerobics.

• 如发现有膝关节疼痛情况，最好选择游泳、水中有氧操等能较好保护膝关节的运动。

  If one finds that one's knees are hurting, it is best to choose exercises that protect the knees better such as swimming and aquatic aerobics.