The form isometric is used as a modifier. isometric 用作修饰词。
N-PLURAL 静力锻炼法;等长收缩肌肉锻炼法Isometrics or isometric exercises are exercises in which you make your muscles work against each other or against something else, for example by pressing your hands together. 静力锻炼法;等长收缩肌肉锻炼法