From personal experience: get a solid sleep schedule, go to the gym if it makes you feel good (just do cardio at the very least to get the blood flowing!), drink lots of teas, limit caffeine intake (drink decaf instead of regular if you like coffee though), relax your muscles (especially your shoulder muscles (important on the race track too; if your shoulder muscles are tense, your peripheral vision gets limited because your body goes into the "fight of flight" response and is trying to find a way out)), stay away from alcohol. Try limiting carb intake too (tough if your in the US where our diet is heavily centered around carbs).
Hope that helps
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