
As quoted in "10 questions for Lance Armstrong" by Bill Saporito in TIME magazine (28 September 2003) http://www.time.com/time/magazine/article/0,9171,1005777,00.html
Context: I'm not happy if I'm not doing some physical suffering, like going out on a bike ride or running. First, it's good for you. No. 2, it sort of clears my mind on a daily basis. And it's a job. My job is to suffer. I make the suffering in training hard so that the races are not full of suffering.