Side profile of a man mountain biking in a forest viewed through yellow aspen leaves, Lake Tahoe, California, USA

Man riding a bicycle downhill, U. S. Route 40, Donner Summit, California, USA

Side profile of a man mountain biking in a forest viewed through yellow aspen leaves, Lake Tahoe, California, USA

Man riding a mountain bike on a dusty summit, Donner Summit, California, USA

Rear view of a man hiking on mountains, Sierra Buttes, Sierra County, California, USA

Silhouette of a man and a woman camping at the lakeside, Lake Tahoe, California, USA

Woman ski mountaineering, Mt Judah, California, USA

Couple walking down a hill, Tahoe Rim Trail, Lake Tahoe, California, USA

Low angle view of a woman climbing a rock, The Buttermilks, California, USA

Family hiking a mountain, Pacific Crest Trail, California, USA

Man climbing a rock with a woman standing behind him for support, The Buttermilks, California, USA

A man jumps off a rock while hiking on a trail near Mount Adams. Washington. USA

Woman mountain biking on a dusty trail, California, USA