Muscle cramps during exercise are an indicator of an imbalance in the intracellular (inside the cell) nutrients.  There are a few; sodium, calcium, magnesium, potassium, anti-oxidants and water (hydration).

A simple and inexpensive trial is to supplement with buffered vitamin C. Vitamin C is buffered with minerals such as calcium, potassium and magnesium. All of the minerals along with vitamin C are in high demand with aerobic exercise and depleted rapidly. Another option is to take extra minerals daily. If the problem persists, you can pursue nutrient testing which will evaluates physiological levels of 30+ nutrients. The test is $265 and is not covered by insurance. It is extremely valuable for those who take supplements and wonder which ones they really need!

NatureMed, an F4 partner, offers this testing.