采用“先疲劳”原理的目的就是克服几乎所有杠铃练习中都存在的一种缺点。这一原理可能比正常情况能更有效地训练任何肌肉的结构。在有两块或更多肌群参与工作的杠铃练习里,当力量最薄弱的肌肉再也不能够完成工作时,就会出现肌肉疲劳现象。而这种情况下,参与相同练习的较大肌群只受到很小的刺激。解决薄弱环节的问题例如,采用杠铃半蹲练习时,当腰部肌肉达到短暂的疲劳时,就不得不停止练习,而这种情况通常是出现在大腿前部用力肌肉充分发挥效能之前。但是,如果采用使大腿前部肌肉群先疲 The purpose of the “first tired” principle is to overcome one of the shortcomings of practically all barbell exercises. This principle may be able to train any muscle structure more effectively than normal. In a barbell practice involving two or more muscles working, muscle fatigue can occur when the weakest muscles are no longer able to complete their work. In this case, larger muscles involved in the same exercises are only slightly stimulated. For example, with barbell squats, when the lumbar muscles have short-term fatigue, they have to stop practicing, usually before the muscles in the front of the thigh have come into full play. However, if used to make the front thigh muscle groups first tired