I'm currently reading Chris McCormack's autobiography, "I'm Here to WIN". I strongly suggest you do too.
My absolute favourite quote (p.212):
"You don't play triathlon. You play soccer; it's fun. You play baseball. Triathlon is work that can leave you crumpled in a heap, puking by the roadside. It's the physical brutality of climbing Mount Everest without the great view from the top of the world. What kind of person keeps coming back for more of that?"
GOLD. Love your work Macca!