That's the spirit this thread needs.
There's a serious buzz from being at one with nature and hammering away up a mountain, giving it everything and testing the body. I wonder about those who run 100 milers though - some of them seem well adjusted, whereas others have somewhat addictive personalities. For example, a good few swapped boozing for running (no bad thing). There's a fella from home who qualified for UTMB but didn't make it in the lottery. One of the lads said that whatever he was into (basketball, cycling, etc.), he went in full steam and became absolutely consumed by it.