And our muscles work in two ways. Isometric contraction means continuous exertion of force. Intermittent force is explosive force, which can be divided into centrifugal contraction and centripetal contraction. Most of the time we exercise latissimus dorsi gluteus maximus are surface muscles, we will use our centrifugal contraction, but to exercise deep muscles, we must use the way of continuous exertion. For example, why can't we get the abdominal muscle by doing plate support? It's because it's constantly tightening your abdominal muscle, so it's isometric contraction, so what's produced is the deep abdominal muscle that our naked eye can't see. On the other hand, if you want to exercise the deep muscles of your erector spine and protect your lumbar disc from protruding, you must exercise the deep muscles to tighten your erector spine continuously, that is to say, the continuous isometric contraction, which is very important in the exercise throughout the erector spine.<br>
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