Jan. 1 marks the beginning of the National Park Service (NPS) Centennial celebration and the seven National Park Service sites in Arkansas will kick off the celebration by launching the Centennial Iron Ranger Challenge – a year-long program to encourage visitors to “Find Your Park” and improve their health and fitness by completing 100 miles of physical activity over the course of the year. Participants may choose to hike, bike, paddle, walk, run, or roll 100 miles in any of the national parks in Arkansas. Visitors who complete 100 miles of activity will receive a certificate and a commemorative patch to recognize their accomplishment, but the real reward will be experiencing the parks and the many benefits of physical recreation.