What is my motivation for attempting to push the envelope at times?

Iraq then continued the attack, attempting to push deeper into Iran.

A second time, he attempted to push himself forward, but couldn't move his feet quickly enough.

He found himself attempting to push over a mountain with his bare hands.

Most important of all, there's no attempting to push your existing system beyond its designed capacity.

She didn't fight me or attempt to push back.

She attempted to push at the logs but they ignored her efforts.

Then I attempted to push the vehicle into the open.

"They are attempting to push through an agenda on behalf of some interest."

His hands lay flat against the table top, as though they were attempting to push through it.