Tenn. Code Ann. § 11-12-205

The commissioner shall review the land surveys prepared by each department or agency, together with the recommendations of any interested citizens group, and shall designate such lands as the commissioner deems suitable as a jogging trail. In designating lands as jogging trails, the commissioner shall consider such factors as accessibility, local interest, safety, and the ability to obtain construction or maintenance assistance from interested groups. In counties with populations of fifty thousand (50,000) or more according to the 1970 federal census or any subsequent federal census, the commissioner shall designate as jogging trails, all lands that are suitable so as to place emphasis on jogging in these counties.