Drink 8 to 16 ounces of water before workout. This is called pre-hydration. During training, drink 4 to 8 ounces of fluid every 30 to 45 minutes. After you finish your workout, drink another 8 to 16 ounces of fluid to ensure rehydration. There is no certain cause for muscle cramps.
Many people wake up in the middle of the night with muscle cramps.
For athletes they are part of the territory. They are only temporarily painful but often difficult to prevent. Applying pressure on the muscle while stretching will help unlock the cramp. Gentle massage can also be beneficial. Don't let thirst be your guide.