It required a physical effort on her part to turn away from him.

That required a little too much effort at the moment.

It required very little time, effort, and attention from him.

"That should tell you something about the physical effort required."

The costs and the human effort required are simply too great.

The reports seemed to require an effort beyond her power.

It seemed to require a small effort to do so.

This was a class that required more effort from her.

I thought about the effort required to rise to my feet.

It no longer required an effort of the vision to see them.