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Never drink alcohol before you work out, even if you're not going to exercise for several hours. Your reflexes can still be compromised, plus your hydration is affected. Do your run or other workout, rehydrate with water, then have a beer if you must. It's best to skip the drink completely before a big competition because effects can linger to the next day.
It also messes with your sleep, so your body doesn't get the rest it needs.