Black Mountain features 20 miles of hiking trails near Crossville, TN.
Several trails to choose from;steep rockey decents,lots of rocks,several more drawn out decents consisting of mostly dirt roads(fast moveing),wet at times,2-4 foot drop offs at times.All depends on the trail you take.Not recomended for beginners.
http://www.tripleblaze.com/trail.php?c=3&i=584