Lay on the floor with your head directly between the two bars. Hold one bar in each hand. Be sure to hold the collar end of the bar. Start with your elbows resting on the ground. Press straight up and return your elbows back to the ground.
While I wouldn't do this as a max effort exercise, you can do this as a supplemental exercise for low reps and higher weight. Work up to a heavy 5. Just be sure you have a spotter to help you get the bars in position.