What is the most difficult part of thru-hiking the Appalachian Trail? Most assume that it's the physical challenge of hiking nearly 2,200 miles. It's not. In no uncertain terms, the psychological and emotional grind is why 7 in 10 hikers ultimately quit on the Appalachian Trail. APPALACHIAN TRIALS is the only resource aimed to equip hikers with the mindset necessary for a thru-hiking the AT.