Chinese Association of Idaho State University (CAISU)
Does stretching increase flexibility?
It helps to understand how your body works. All muscles shorten and lengthen when they are being used. Stretching a muscle temporarily relaxes it and allows it to lengthen. If you were to look at a muscle under a microscope, you’d see striated fibers called sarcomeres—the basic building blocks of muscles. Each sarcomere is composed of two types of filaments or proteins, actin (which is thin) and myosin (which is thick). During a muscle contraction, these filaments slide against each other, while little cross bridges between the filaments enable the muscle to contract and lengthen. Of course, all this takes energy and happens without you even realizing it—but that’s the general process. It’s a microscopic dance between proteins every time you move.
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