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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.
Cramping in the calves has several causes, but the true cause is not fully understood. Your history will likely give the most clues. True muscle cramps involve intense muscle contraction and the muscle needs to be lengthened to resolve the spasm. This differs a bit from calf pain from causes other than cramping that results in muscle spasm. Exercise-related cramps are likely caused by muscle fatigue and may involve the Golgi tendon bodies, which normally fire to inhibit the muscle from contracting too hard.