Sore Is Good, Pain Is Bad: The Workout of a 79-Year-Old Who Twice Summited Everest

When Bill Burke retired from practicing corporate law in 2003, he craved an activity that would indulge his passion for travel and challenge him mentally and physically. He had already been hiking in the mountains around his home in Costa Mesa, Calif., and learning the art of alpinism had more appeal than tennis or golf, he says.

He attended a high-altitude climbing course, upped his training and within a year was peak bagging mountains around the world. By age 67, he had climbed the highest mountain on every continent, including Mount Everest twice. Today, he is one of the most respected mountaineers in the world and even has a peak near the Nepal-Tibet border named for him.