Alex Honnold is a big wall free solo climber. A documentary feature film titled "Free Solo" captures his record setting ascent of El Capitan.Alex Honnold is a big wall free solo climber. A documentary feature film titled "Free Solo" captures his record setting ascent of El Capitan.Alex Honnold is a big wall free solo climber. A documentary feature film titled "Free Solo" captures his record setting ascent of El Capitan.