Charley Horses
Charley (or Charlie) horses are muscle cramps general caused a deficiency in vitamins or minerals.
If you find yourself getting frequent charley horses then you likely have a deficiency in your diet. Try taking vitamin E tablets, and make sure you are getting potassium and magnesium.
Bananas are rich in potassium, and magnesium can be found in spinach, tofu, and dried pumpkin seeds.