- physical challenge - to get fit; to test themselves; to set a record; ....
- mental challenge - to change themselves; to test themselves
- to heal - some people start the hike following a personal tragedy
- escape - from the crowd; from the job; from the daily rat race
Also a big part of it was the physical challenge to get fit and to lose weight. I think the time I spend doing this now will pay big dividends for the rest of my life.
The reason I am doing it now is simply because I can. The early retirement from SWIFT, while unwelcome is some ways, allowed be to take time out, and spend 7 months chasing what was previously only a dream.