Good article, after many years of training athletes and myself I found out that it seemed to be different for each person. I was one that had the most trouble with abs cramping, not usually when i was training but other times ,especially during sex,lol. Magnesium has helped but not the cure all. Mine was always worst at my leanest,which is common with most people I think. Sometimes a good dose of sodium would help at times it wouldn't. I'm all but sure all cramps have to do with out of balance electrolyte rhater than one particular one. But when you see multimillionaire athletes with unlimited resources and testing having problems you know there is probably something more than nutrition and electrolytes causing the problem