I am asked a lot, "What can I do to prevent my muscle cramps?" I just got my second such question of the day. I wish I could tell people that all you had to do is X and miraculously your cramps will be a thing of the past. Problem is, no one knows for sure what causes cramps. It's unlikely to be sodium (or potassium, magnesium, calcium, etc) despite what you have been told and read your entire athletic life. The research simply doesn't support any of this. But it's difficult to change the minds of hundreds of thousands of people when the sports drink industry spends millions to softly convince you that you just need more salt. I wish it was that simple. If it was I wouldn't keep getting this question. The best I can do is to help educate you about how little we know about this common affliction. Perhaps with a little education you can do a better job of figuring out the cause of yours. What I'd suggest you do is go here, scroll down a little bit, and read the section titled "Muscle Cramps." This is an excellent summary of what is known by sports science currently on this topic. Good luck with your quest for an answer!