I'm running, I'm biking, I'm swimming... breaststroke.
The problem is, when I try to swim anything else than breaststoke (backstroke, crawl) I'm getting calf cramp very quickly... which is double stressful because I'm generally swimming open-water.
I have a bit of endurance, I can run 20km or swim 2km breastroke (probably more, I haven't forced myself because body cooling from water is a limiting factor for me), but somehow this crawl/breastroke leg workout makes my calf dead. And I have no idea what and why.
What I can certainly say that my legs move much quicker than by running/biking so maybe my muscles have an issue with quick movements and get mad (cramp is a result of too stark contraction of muscle caused by too strong steering impulse from nerves AFAIK). Is it something genetical or that can be worked out with targeted exercises?