Mitochondria development occurs when you're running - actually, doing aerobic exercise for long period of time. Mitochondria is responsible for intra cell energy exchange and utilization of "waste".

My trainer told me that professional runners, swimmers and skiers are pretty vulnerable for alcoholism, because mitochondrias greatly help to utilize products of alcohol metabolism. So there is buzz, but no hangover, you can do it over and over again. Until someone becomes physically dependent on alcohol.

You be warned. ;)