Fresh air, bright sun and the feel of rough rock is a unique combination that millions of Americans – about 1.6 percent of the population, according to research – enjoy every year. National and state parks in the U.S. and all over the world offer thousands of opportunities for a thrilling challenge. Rock climbing is a thrilling sport that can be dangerous because of unpredictable factors such as falling rocks and weather. Unfamiliarity with the route or not knowing where the holds are, can also be a problem. All of these, though, teach climbers problem-solving skills. This makes the sport exciting and one of the reasons why it’s growing in popularity.