Got muscle cramps and a splitting headache? You could have an electrolyte imbalance, which is the end result of significant sweat loss. Electrolytes [e.g., sodium, potassium and chloride] are all-important minerals that help your body maintain fluid balance. To bring it back to equilibrium and keep dehydration at bay, reach for a sports drink with 14 grams of carbs and 70 milligrams of sodium per eight ounces every 15 to 20 minutes during intense activity.