muscle-building exercises (or a system of musclebuilding exercises) involving muscular contractions against resistance without movement (the muscles contracts but the length of the muscle does not change) 同义词：isometrics,
Isometric exercise or isometrics are a type of strength training in which the joint angle and muscle length do not change during contraction (compared to concentric or eccentric contractions, called dynamic/isotonic movements). Isometrics are done in static positions, rather than being dynamic through a range of motion.
例句与用法
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Make double use of waiting time , driving time , walking across campus time , or time when you ' re doing routine tasks : read , write letters , listen to lectures that you ' ve recorded , listen to notes and outlines you ' ve recorded , make schedules , do isometric exercises 加倍利用等人、驾车、过校园及完成常规任务? ?阅读、写信、听演讲录音、笔记和摘要录音、制订日程计划、做化学异构练习? ?的时间。
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