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Charlie Wittmack climbed to the summit of Mt. Everest on Friday, the latest achievement in an extreme test of human endurance that began in England 10 months ago.

This Sunday, 10 years after Lance Armstrong learned he had cancer, he'll join 40,000 people running the streets of New York City in the ING New York Marathon. He talked with Wayne Drehs about his goals and why he's doing this now.