Vinny Mauri, a self-coached marathoner, ran 45 miles on a treadmill in Ohio before the Chicago Marathon. He completed the session by running long reps and intervals, totaling 36 miles of work.

Mauri's training included a morning session of long reps and an afternoon session of intervals. He ran at his body's pace, averaging 4:56 per mile. He described the session as hard but felt strong throughout. Read more culture coverage.

This training day was part of his preparation for the Chicago Marathon, where he finished 10th. Mauri's training regimen included two hard days a week, with this session being one of them. Related: Vinny Mauri on Record Pace for 30K at Chicago Marathon.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.