Alex Honnold faces the biggest challenge of his career, climbing El Capitan in Yosemite National Park. He pursues it Free Solo, which means climbing without a rope and alone.Alex Honnold faces the biggest challenge of his career, climbing El Capitan in Yosemite National Park. He pursues it Free Solo, which means climbing without a rope and alone.Alex Honnold faces the biggest challenge of his career, climbing El Capitan in Yosemite National Park. He pursues it Free Solo, which means climbing without a rope and alone.