I have a client who is struggling with leg cramps while he is training for his marathon. At about 15-18 miles the cramps muscle.
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Electrolyte solutions may not be enough sodium and potassium for him depending on the climate he trains in and the amount that he sweats. Personally, during my marathon training, because I train in sunny California, I need to not only supplement with electrolytes during runs but also over salt my food and add salt to my water throughout the day to prevent cramps.