free solo climbing
US /friː ˈsoʊloʊ ˈklaɪmɪŋ/
UK /friː ˈsoʊloʊ ˈklaɪmɪŋ/
1.
a form of rock climbing where the climber ascends alone without ropes, harnesses, or other protective equipment, relying solely on their physical strength and mental fortitude
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Alex Honnold is famous for his free solo climbing of El Capitan.
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Free solo climbing requires extreme skill and courage.