She'd hated putting that much extra strain on the mare, but there was no help for it.

But I think all that was just the extra strain.

It was the extra strain upon his wound which had sent him into the present state of unconsciousness.

I cannot afford to throw any extra strain upon it.

This can place extra strain on the logistics of the event, for example, how long teachers should be available after hours.

Sexual activity may put extra strain on your heart, especially if you have heart problems.

They were not designed to cope with the extra strain.

The movement of his chest seemed to throw extra strain on his hands.

All these metabolic events can be an extra strain on the heart.

I think it's some extra murderous new strain of cold.