FILE - In this July 27, 2015, file photo, a long line of hikers head out of the Grand Canyon along the Bright Angel Trail at Grand Canyon National Park, Ariz. #NationalTakeAHikeDay trended Friday on Twitter, used both literally and metaphorically.
FILE - In this July 27, 2015, file photo, a long line of hikers head out of the Grand Canyon along the Bright Angel Trail at Grand Canyon National Park, Ariz. #NationalTakeAHikeDay trended Friday on Twitter, used both literally and metaphorically. Ross D. Franklin AP
FILE - In this July 27, 2015, file photo, a long line of hikers head out of the Grand Canyon along the Bright Angel Trail at Grand Canyon National Park, Ariz. #NationalTakeAHikeDay trended Friday on Twitter, used both literally and metaphorically. Ross D. Franklin AP