I had n't beaten my previous 5k time .
What 's more I just did n't have the mental energy to push myself to do the 10K run that I had planned and had to stop half way and then walk back -- the walk of shame .
I had n't beaten my previous 5k time and what 's more I just did n't have the mental energy to push myself to do the 10K run that I had planned and had to stop half way and then walk back -- the walk of shame .