Know Your Greater Purpose
What is your purpose for running? Sure, it may be to improve health and physical fitness. Or, maybe you are competitive and want to be faster than your friends and set a personal best. Those are great reasons to run, but is there a greater purpose behind your running?
Imagine if all the usual reasons for running didn't apply. The multifarious purposes of running—health, physical fitness, sense of personal satisfaction—can be achieved by taking a pill. Would you still run? If your answer is yes, then you must think that running has something more than mere instrumental value.
If your purpose is solely to beat your friends, run a personal best or lose some weight, then it's easy to feel under-accomplished anytime you don't. Instead, if your purpose is larger and focused on the big picture, then it's easier to manage setbacks and replace running with a different activity that fulfills the same purpose.