Today's true sports drinks are still the classic Gatorade -- packed with the electrolytes potassium, magnesium, calcium, and sodium to provide energy during intense workouts -- as well as competitors such as Cytomax, Allsport, and Accelerade.
1 Low levels of minerals, such as sodium, magnesium or potassium, in the body can be one of the reasons for Charlie horses. 2  Deficiency of calcium in pregnant women can also be another reason for the onset of Charley horse.  Low level of liquids in the body, while exercising, might be a probable cause of Charley horse.
What Causes Charlie Horses? Charlie Horses is the name given to muscle spasm experienced by an individual, especially in the leg. The most probable area where Charlie horse strikes is the calf region and at night. In case of such a spasm, the concerned muscle contracts and cramps, without any slightest indication beforehand.