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A calf strain can be the result of a variety of conditions, from mild stretching and pain to a partial tear or a torn muscle, notes Running Times magazine. In fact, a calf strain can and should take you out of the running game for a few days at least.
Muscle tightness: It sounds like you have some tightness in your calf muscle. I would suggest 5-7 minutes of easy jogging followed by stretching the affected area prior to running at a faster pace. If you try to run before stretching you might tear part of the muscle.