Silhouette of professional highliner Hayley Ashburn standing up on a highline above the clouds atop Mount Tamalpais, Marin County, California, United States

20 24 years adrenaline arms raised balance barefoot california caucasian ethnicity challenge climbing equipment cloud concentration confidence conquering adversity day determination extreme sports full length highlining horizontal marin county one person one young woman only outdoors risk rock rope side view silhouette sky slacklining tightrope usa walking