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Help and advice badly needed. I am a bad swimmer, I couldn't do more than a length at first, and have had lessons to help. However, in order to go further (say 400m, rather than normal 100m's) I have to seriously reduce my leg kick. The problem s they then sink and I go slow. The Swim4Tri guys are helping by giving me basic kick drills, but seriously one length of kick only and I am utterly exhausted. I am comfortably running 10k'S etc, but swimming is starting to beat me.
Any advice? How hard should I be kicking (perceived effort out of 10)?