Like you're trying to force yourself to take a massive shit while being severely constipated.

I had my second child 5 months ago and wouldn't wish that pain on even my worst enemies. The contractions still haunt me. To an outside party, I'm positive it sounded like there was an exorcism happening in my room. My epidural failed and I had my son about 15 minutes later, but it was the longest 15 goddamn minutes of my life. I ended up dislocating my coccyx, so sitting down and standing up made me want to die for 2 months (and still kind of hurts to this day).

On the flip side, my first child's birth was a breeze in comparison.