训练技巧的不同可能会加重膝关节劳损。

Differences in training techniques may add to the problem.

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健康问题始终伴随着他们，满布血丝的眼睛，强酸环境造成的牙齿腐蚀和脱落，哮喘，过敏，胃痛，还有膝关节劳损。

Health problems include bloodshot eyes, teeth eroded to stumps due to the acidic conditions, wheezing, allergies, sore stomachs, and damaged knees.

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这增加了膝关节的劳损。

This increases strain on the knee.

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