Appreciate your contribution, homie. But, unfortunately I wasn't trolling.
Pushing a car, as stated, was part of the "physical agility test" that I had to take as my second step in becoming a police officer. I wanted some technique tips because the car push was part of an obstacle course that was done for time. I have never pushed a car by myself is, I guess, how I should have put the original statement.
Ninja edit: I guess technique was important, because 3 people in the test actually failed to push the car. One poor guy actually had the car rolling backwards, somehow.
As an update to this - using some of the tips - keeping the hands close and tightening up the glutes/core before I started digging in helped. I passed, and actually ran the fastest course time of the day. This was not because I was billy badass on the car push. It was because I was so hyped up and ready to go. The advice was appreciated.