He needed to focus all his concentration on that shot.

However, she assumed that retraining would focus her concentration again.

Once again, he focused his concentration on the growing pain in his head.

He focused all his concentration on remembering the correct coding.

It was difficult enough to feel like a real person in a real place; I had to focus all my concentration on that.

She focused all her concentration on getting it right, not daring to look at Nathan, or even to think about what would happen next.

He found it helped to focus his concentration by blocking out the noise from the street and the students who lived in the next flat.

Which basically means you're focusing your concentration on something that has nothing to do with anybody else.

But you must learn to focus your concentration.

Shutting his eyes, he focused all his concentration on her.