She dropped down onto the ground and rested her back against a boulder.

He pulled himself up into a sitting position, back resting against a great hot boulder.

She finally came to a stop when her body slammed against a boulder.

It leaned against a boulder for a moment, despite its terror.

Robert sighed as she helped him sit back against a boulder in the shade.

Huddled up against a large boulder, he could see the form of a girl his own age.

Push against a boulder and it doesn't, or at least not very much.

They set him down, his back against a large boulder.

He leaned against a boulder and moved it out of the way.

She might as well have beat her head against a boulder for all the effect it had.