Staying hydrated is particularly important during exercise.  Dehydration may lead to dizziness, fatigue and cramping and can be caused by inadequate fluid intake, excessive sweating or failure to replace fluid during and after exercise.  A post exercise session in the sauna can exacerbate the situation.  Adding an electrolyte powder to water that you drink whilst training or after exercise replaces minerals lost through perspiration.  Minerals such as calcium and magnesium are critical for nerve and muscle function as well as water regulation in the body.