On the rare occasion that I am having a hard time getting out the door, I do a version of this. I tell myself, just go 1 mile. When I get to the turn around point at 0.5 mile, I usually can talk myself into another half mile. Now my run is up to 2 miles if I turn around. Then I do it again. By the 3rd of these, I am far enough into my run that I just decide, well I’ve gone this far, I might as well finish whatever the plan called for. I would say 90% of the time, I end up doing my full run. Only a handful of times have I ever gotten to the 1 mile turnaround and thought, yep, that’s it for today and headed back. But, if that’s how I feel, I turn around.