Examples of using "Сосредоточься" in a sentence and their english translations:
Focus.
Focus!
Focus!
Concentrate, Tom.
Focus on the present moment.
Keep focused on your work.
Focus on the details.
Concentrate on what you're doing.
Don't look out the window. Concentrate on your work.
Focus on one thing and do it well.
Keep focused on your goals.
Focus on your breathing.
Focus on the task at hand.
If the task must be done now, then that's what we call "concentrate".