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Calf muscles may have gradually tightened up over a period of months through not stretching enough before and after training. Tiny micro tears in the muscles cause them to go into spasm. When they are in spasm or contracted then blood cannot easily get into them. The muscles have squeezed the blood out like a sponge.
Calf cramps can develop if you overuse the leg muscles and they become fatigued during excessive biking or running. It can also occur if you strain the calf muscles with sudden jerky movements or by not properly preparing your body for exercise.efining Muscle Cramps. The cramp can occur in all or just part of the muscle. Photo Credit Maridav/iStock/Getty Images. A muscle cramp is a sudden and intense contraction or spasm that can develop in any muscle group, including the calf.