Keep focused on the fun and on how well your body is working, especially on 'thon day, to keep the chest pumping relaxedly. If it starts to tighten up RELAX-- it's just the normal response to the adrenaline from the race atmosphere, but if you panic it will get worse and worse and..... so just breathe and enjoy, maybe sing a bit while jogging a bit slower to reboot the breath.

~Susan