After an hour of reading, she leaned back in her chair and decided she'd had enough.

Another member of the group leaned forward in his chair.

I put down the phone, leaned back in my chair, and looked around the office.

Then I leaned back in my chair and thought a bit.

He leaned back in his chair, and thought for a moment.

I leaned back in my chair, thinking about the situation.

Then he sat down and leaned back in his chair.

He leaned back in his chair and considered the matter.

The chief of the watch leaned back in his chair.

He leaned back in his chair for a moment, then stood.