Focus on breathing.
Meaning: This means to pay attention to the sensation of breathing and make it the primary object of concentration. It's like saying, Pay close attention to your breath.
Choice of Words: Focus is a verb meaning to direct one's attention or efforts towards a particular activity or goal. Breathing is a gerund, a verb form that functions as a noun and refers to the action of breathing. Together, they form an instruction to concentrate on the act of breathing.
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Related Expressions