how far longest run before marathon
Your Privacy Rights Canadian Customers. 1  It seems like common sense that to prepare for a marathonâan event that includes a heck of a lot of runningâyour training should also include a heck of a lot of running. Thatâs why marathon preparation dogma preaches that you need to do one long, 12 to 26 mile run each week. The problem: That often puts too much mileage on your body, says Mark Conover, director of the cross-country and track-and-field programs at California Polytechnic State University.