Put it in reverse!
Reverse the car!
Move backwards!
I hope you noticed it is easier to move forward than going backwards. I guess it is because our face is meant to look forward.
When you put it in reverse, you are constantly looking backwards. Your attention is no longer forward, and by implication you are focused on the back.
This is applicable to your life too.
When you are focused on the past, you will hardly have time for the future. Reverse is good, but it can hinder your progress moving forward.