The professional climbers are tackling El Capitan 's biggest challenge . They relieve themselves in plastic bags . The Dawn Wall is a sheer cliff face in Yosemite National Park . They are only using their hands and feet to climb upwards .
The professional climbers are tackling El Capitan 's biggest challenge . The Dawn Wall is a sheer cliff face in Yosemite National Park . They are only using their hands and feet to climb upwards .