求翻译：Once more, throughout the pushup keep your pushing hand, your planted foot, and your lower abdomen rigidly in line. To quote Masatoshi Nakayama again, “Tensing the muscles on the front and sides of the abdomen links the pelvis and the shoulders. A stable pelvis and the complementary muscle groups of the thigh working together contribute to strong movements and a stable stance. This strong foundation gives support and makes it possible for the power of the hips to be transmitted to the arm.”是什么意思？

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