Take adequate liquids, sports drink like Gatorade,  fruit juices , buttermilk,  lemonade etc. 2. Stretch your calf muscles daily. 3. You can massage leg muscles and apply cold pack when they pain. In cases of severe pain take simple analgesics like paracetamol. 4. Avoid prolonged standing or sitting cross-legged. Change postures in between. 5. Take calcium supplements. 6. Take healthy nutritious diet. 7. If you are taking medicines like diuretics,  statins, review with your doctor as they can cause cramps too. If problem persists get your thyroid profile, kidney functions  done and consult with your doctor.