Some time usually after long working days, a sudden pain in calf muscles arises. usually its unbearable and only short term workaroud, like stop the blood circualtion in lower leg by raising legs above waist , give some relief. usually pain sustain for 1~2 days. But doing instant squats or going for 2~3 km jogging releives it immidiately. Also the same pain i feel when months passes without me doing any leg exercise. is i am lacking in proper exercise or some nutrition?