Four different ultrarunners are running across North America

Pete Kostelnick, Mike Wardian, Dave Proctor and Richard Donovan are just the ones we know about

Trail runner sets 50K treadmill world record

Mario Mendoza of Bend, Oregon is the second person to go sub-3 over 50K on a treadmill

Michael Wardian finally wins Marine Corps Marathon (the new 50K distance)

Victory was sweet for the ultrarunner, who lives in DC and who has been trying to win the MCM since he ran his first marathon, 23 years ago