National Trails Day® is a celebration of trails that evolved from the report of President Ronald Reagan’s President’s Commission on Americans Outdoors. In 1987, the report recommended that all Americans be able to go out their front doors and within fifteen minutes, be on trails that wind through their cities or towns and bring them back without retracing steps. America’s 200,000 miles of trails allow us access to the natural world for recreation, education, exploration, solitude, inspiration, and much more. Trails take us to good physical and mental health by providing us with a chance to breathe fresh air, get our hearts pumping, and escape from our stresses. National Trails Day® events involve a broad array of activities, including hiking, dog walking, bike riding, trail maintenance, birding, wildlife photography, geocaching, paddle trips, trail running, trail dedications, health-focused programs, and children’s activities. Whatever you like to do outdoors, there is bound to be an event to fit your interests. If you don’t find the type of event you want, then plan it yourself — and be sure to register it. Trails give you the opportunity to get your heart pumping, lungs expanding, and muscles working at various levels of difficulty, thereby improving your physical as well as mental well-being. With obesity rates skyrocketing, exercise is increasingly important, and trails provide a wide variety of opportunities for being physically active.

Source: http://www.americanhiking.org/National-Trails-Day/Info/