It is a gorgeous Saturday in early fall. After a busy week in the clinic, you and "Chris" — your fellow PT — are hiking on a backcountry trail near a popular but difficult-to-reach rock-climbing area. Suddenly you hear a loud thud followed by a painful groan. You look up the trail and see a young adult male laying on his back at the base of a rocky cliff. He obviously has fallen while climbing and landed hard. His two teenage climbing buddies run up to him and yell, "Tyler, are you alright? Can you get up? Come on Tyler, get up!"