Its a big lesson, if you're just not feeling it on one day, the problem might not be your body, it might be between your ears. As Tony says, focus on the workouts for the duration. Try to block out what you did before your workout and what you have to do after. Focus completely on your workout at that exact moment. Focus on the rep and set you're on in the present.
That being said, I am excited to show you all the video below. I did well on Ab Ripper X today.
Keep Pushing Play!
Keep Bringing It....