Don't be fooled into believing exercise will cure your hangover because I’m afraid it won't. However, it may help ease the symptoms if you choose your exercises carefully. Alcohol slows the brain down, slowing the release of serotonin: the feel good hormone. Exercise can help to stimulate the release of serotonin, putting you in a better state of mind, as long as you exercise rehydrated.
To make sure you don't overcomplicate the mind and the body in this hungover condition, I recommend you stick to light-weights, high reps, and work from machines only. When you're recovering from a heavy night, you may be more uncoordinated than usual and more apt to injure yourself if using free weights.
Next time you wake with a pounding head after one too many jars, get yourself down the gym and try this...
1. Lying Leg Curl into Seated Shoulder Press = 3 x 15 reps, 45-60 rest between sets.
2. Upright Leg Press into V Grip Lateral Pull Down = 3 x 15 reps, 45-60 sec rest between sets.
3. Leg Ext into Chest Press = 3 x 15 reps, 45-60 sec rest between sets.
4. Preacher Curl into Standing Calf Raises into Cable Triceps Ext = 3 x 20 reps, 30-45 sec rest between sets.
Typically, you wouldn't do any abdominal work unless you have an upright abdominal machine at your gym, as the position you place your body in will cause extra pressure to the brain due to dehydration, which could start your headaches again.