On Sept. 17, be part of session number 5 of the free, runner-coordinated Discovery Run Training Series in Rothrock State Forest on eight Saturdays, put on by Tussey mOUnTaiNBACK 50 Mile Relay and Ultramarathon. (The series will finish up 8 days before race day, Oct. 16.) The series covers the whole 50-mile course, a chunk at a time. All of the Discovery runs begin at 8 a.m. and start from various locations within the forest. You can access details, including distances, driving directions and the series schedule on the Events page of the race website or directly at https://www.tusseymountainback.com/events/mountainback-discovery-series/discovery-clockwise-ccw-course for details.