best workouts for tired people

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Why you're tired: You didn't get to bed until 3 a.m.

What to try: Skip your workout. Go to sleep.

Why it could help: If you didn't get enough rest last night, a 20-minute afternoon nap can help you get through the day. Getting a full 7 to 8 hours tonight will help you feel better tomorrow—strong enough to rock any workout you choose.