hydrate after workout

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"I drink 16 ounces of water during a 45-minute class, and I double it if the class is longer than 45 minutes," says Wendy Wolfson, a Flywheel Sports instructor in New York. "If I'm leading the class, I usually forget to drink, so I'll finish an entire bottle of water after it's over but before I walk out of the studio. Either way, I'm rehydrated before I go about the rest of my day." Subpar hydration could set you up for crankiness later—being dehydrated by just 1.36 percent had negative effects on mood and concentration and increased headache symptoms among female subjects in a small study in The Journal of Nutrition