I am currently a freshman in college and I am very interested in thru-hiking the appalachian trail the summer after my sophomore year. Between the end of the term and the start of the new academic year I would have 119 days to hike the trail, around 18 miles a day. I am a former cross country runner and I am in pretty good shape. I could also start training before the hike if necessary. I have never attempted any sort of long distance hike before, but I have a positive attitude and really believe I could make it. Is averaging 18 miles a day a feasible goal for a first time hiker?