2. Prioritize your sleep.
If there is one single thing you can do to improve your marathon performance without doing anything, it’s sleep. Over the next six weeks, aim to get into bed just 30 minutes earlier. Shut it down, turn it off, and go to bed. As marathon day approaches, consider choosing a few minutes of sleep over a mile of running. For example, if your schedule suggests that you run 6 miles on a Thursday, but this would require you to wake up at 5:00, consider running 5.5 miles to wake up at 5:15. It won’t make a bit of difference in your performance to run that ½ mile, but the benefits are cumulative. Try and capitalize on that.