I never expect PR's every time while working out. As a matter of fact, PR's should be saved for actual competition whether it be on the platform, field, court or ice.
I believe you only get so many personal records in your life, so don't waste them.
What I do ask of people is to be better than they were last time or even as close as yesterday. Somewhere in the training session best yourself somehow. It is important to understand that "training" is not a sprint, but a marathon, and marathoners pace themselves.
By committing to being better today than yesterday you will chip away weakness and most assuredly excuses. It also helps you to keep focused on the long term goals by reinforcing the knowledge that you are step by step, very methodically making the correct adjustments to obtain your goal.
What did you do to get closer to achieving...Today?
Today's Training:
AirDyne: 30 mins
C/S Row: 4x8x145
DB Row: 4x8x105
Lat Pulldown: 4x8x160
BB Curl: 4x8x95
DB Curl: 4x8x30