Cancel anytime. YOSEMITE NATIONAL PARK, Calif. (AP) — A popular rock climbing area in Yosemite National Park has been closed because of a crack that has developed in a massive granite cliff.

The air in popular indoor rock climbing wall facilities is laden with potentially toxic rubber particles, some of which have been linked to cancer, new research suggests.

The first of 8 episodes teaching crack climbing, by the Italian Mountain Guides. Episode #1 provides a general overview of the various aspects involved in mastering this important clean climbing ...