runners depression 

failed to complete a workout run for an extended period of time and frankly dont give a damn.

I have runners depression since I haven't run in 2 weeks, and I could care less.

runners depression by twitfollower May 12, 2011

Runner's Depression 

the opposite of the Runner's High; the sadness runners feel during extended periods of not running; after distance running, runners become happy on the endorphines their brain releases, so the lack of running and lack of endorphines causes a feeling of depression

Stephanie had Runner's Depression after her track season finished.

Runner's Depression by Mikimawse January 26, 2012