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Dan Kosick (photo by Jim Howe) Dan Kosick (photo by Jim Howe) He's an obstacle-course endurance athlete. He climbs mountains. He coaches lacrosse. He was a Paralympic ski racer. At age 15, Dan Kosick had to have his lower right leg amputated after a cancerous tumor was discovered. Now 41, he has kept sports in his life as well as a positive attitude. He's an obstacle-course endurance athlete. He climbs mountains. He coaches lacrosse. He was a Paralympic ski racer. At age 15, Dan Kosick had to have his lower right leg amputated after a cancerous tumor was discovered. Now 41, he has kept sports in his life as well as a positive attitude. Click here Click here to see what he can do as an adaptive athlete in a video called "I Train So I Can," sponsored by the Merrell footwear company. to see what he can do as an adaptive athlete in a video called "I Train So I Can," sponsored by the Merrell footwear company.