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I'm currently training for the GPW recruitment st helens 10k run, (so far hitting about 50 mins) I've previously done a triathlon and a 5k swim. My question is, that although my breathing and heart rate does increase, I don't get out of breath, for all of these events I simply finished and normal breathing resumed. I think this may have something to do with my swimming breathing, but is it not odd that my muscles are whats holding me back and not my sort of 'endurance' breathing wise. A fellow coach at swimming said that I've built too many slow twitch muscle fibres due to my weights regeime in the gym so my muscles have no stamina. Any ideas anyone? + Yay first post!