"Challenging Trails" refers to hiking paths that require a higher level of physical fitness and skill. These trails often feature steep inclines, rocky terrain, and varying weather conditions, making them suitable for experienced hikers. They can be found in national parks and wilderness areas, offering stunning views and a sense of adventure. Hikers on challenging trails should be well-prepared with proper gear, such as sturdy boots and navigation tools. Safety is crucial, as these trails may have limited access to help. Popular examples of challenging trails include the Appalachian Trail and the Pacific Crest Trail, both known for their demanding routes.