Potomac River Running and Sport and Spine Rehab are sponsoring the =PR= Spring 2015 Trail Fun Run Series. The trail runs, for runners of all speeds, are free though one does need to register in advance so that =PR= can get an accurate count of runners. Runners can choose 30, 60 or 90 minute guided runs. The runs start at 7:30 am. Groups form according to planned running time, instructions are given and everyone heads out on the trail.