I get that too. A few things I've noticed, but yet to perfect to the point of eliminating the cramp. Bananas are good, but they don't prevent it for me. Hydration is really important. Get enough water, but not RIGHT before swimming of course. Also, how hard you push off the wall in your turn is a factor for me. I try not to push too hard in my training and that helps. I figure in an OWS I won't be pushing anyway so I go gentle off the wall.
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