Ultra marathon man

His journey into extreme endurance is fascinating, but I'm curious about what motivated him in those early days to push so far beyond typical limits.

Karnazes' stories of perseverance are incredible, but I wonder how many readers felt motivated to set their own tough goals—or if it felt a bit intimidating.

The descriptions of the races are vivid, but I’m curious whether the core message is more about physical stamina or the mental strength required to keep going.