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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.
A muscle strain is a stretch or tear of muscle fibers. In the leg, muscle strains happen when a muscle is either stretched beyond its limits or forced into extreme contraction. Because the leg has many different muscles, it is vulnerable to several different types of muscle strains. Calf muscle strain (gastrocnemius strain). The calf muscle typically gets strained when the foot suddenly bends upward, stretching the calf muscle beyond its limits. At the time of injury, you may hear or feel a pop inside your calf -- the sound of the muscle tearing or shearing away from the Achilles tendon.