I agree with CorsairMac. In fact I don't even kick really, more just let me legs act like balances. If I kick or get tense I get the foot cramps, which if I don't get rid of right away will turn into calf cramps before the end of my swim. Because triathletes spend most of their time in two sports where the foot isn't relaxed and rarely points swimming is foreign to the feet. Make sure you stretch those feet, and also point and flatten them along with your stretching