Marathon training schedules can vary greatly depending on the runner’s personal goals, level of experienced and things like available time to spend on training runs. Most common schedules for the average recreational marathon runner consist of a long run on Sunday and a couple of easier runs during the week with a tempo run or an interval run in the middle of the week. For those who work a busy job with commuting and a family might have little time during the week and would put a tempo run on Saturday to make the long run on Sunday a little more challenging. For those recreational marathon runners with a bit more free time on their hands could do two hard runs back to back on Tuesday and Wednesday and recover or rest on Thursday and Friday to do only a long run on Sunday. Whatever training schedule you choose the most important thing to do is not to deviate from your planned intensity and distance for each day. Overtraining often comes from going too fast on easy days.