Agree with water imawaterbender. When I start having cramps I push off more with legs only and stop using the feet as much. Sort of keeping them flexed a little more, and not extending them. I started get more cramps as I was attempting to add distance. So I started adding Mio electrolyte stuff to my water. Would drink a bottle before my swim and during. No calories added so no worries. Also attempted to eat a little more before my workout. Fruits or a protein shake. All that seemed to work. I also started doing my kick drills earlier in my workout. If I wait till later I'm guaranteed to get bad ones in feet, calves and thighs. Hope this helps.

I was having the same problem last summer. After about half an hour, it would start in my feet and if I didn't stop, it would move to my calves. I think it is because when you swim, you naturally point your toes which is unnatural for those muscles. I have only been in the pool a couple of times this spring and so far so good. I have been cycling more and it seems to help because I use the same muscles. So, maybe if you find a way to work those muscles more and strengthen them, it will be better?

Sometimes I get cramps in my feet, but not lately... I usually try to swim through them and relax. I always have a bottle of water with me, and I add iForce Compete to it for cardio workouts. What bothers me the most is my hands cramp up... and then aren't too happy with me for a bit. I use my hands a lot though (I am a musician, and a day desk job on the computer), so it might be overuse.