Does exercise "sweat out" a hangover? No, the reason you can feel better after exercising with a hangover is NOT due to "sweating out the alcohol", but rather the exercise causes a release of endorphins (often called the "feel good" hormone) & also tends to increase alertness (similar to a cup of coffee).

Is working out while hungover bad?

“A major problem with a hangover is of dehydration, and by attempting to sweat it out, further dehydration occurs.” This can make exercising feel far more physically draining, due to the inevitable fatigue, body aches and possible nausea that accompanies the layman's hangover.

Is it good to exercise after a night of drinking?

Alcohol is a depressant, meaning it slows you down. Your reaction time, strength, endurance, and aerobic capacity will all likely suffer, so your workout won't just be potentially dangerous — it's bound to be less than optimal. The full effects of alcohol aren't immediate.