Shout. Scream. Do what you have to do to drown out that voice in your head that says ...
Go back to sleep.
You don't need to run today.
You deserve a break.
You've done enough.
IF you don't drown out that voice this morning, then THIS is what you'll hear aaaaaaalll day....
I should've run.
I feel so guilty.
Maybe I'm not a runner.
I'll have to run tonight.
Remember why you run. Write those reasons down right now. So when you need something to shout and scream at that voice that tells you not to run ... shout and scream your reasons.
Shut them up. Drown them up. Shoes on ... RUN.