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I'm training for my first triathlon. In recent weeks, I've been getting persistent cramps when swimming, which I find a little odd, as to be honest, as the swimming isn't the hardest training I do, and certainly not particularly hard on the legs. The cramps alternate between legs, and tend to be in the calves, but have also been in the quads. I'm basically cramping up every time I swim after about 1200m or so.
I've increased training up a bit in the past few weeks: running 3 or 4 times a week, turbo trainer 2 or 3 times a week, and swimming once or twice. Given that the cramps move about a bit, I am assuming it is probably something to do with diet - seems reasonable? Any advice?