First of all, the correct way to breathe should be deep breathing. When doing push-ups, when squatting down, take a deep breath and fully inhale oxygen into the lungs. When you push your body up, exhale slowly and expel carbon dioxide from your body.
Secondly, the rhythm of breathing should match the rhythm of action. When doing push-ups, you usually need to do continuous movements, so you should breathe continuously. Inhale when the body is pressed down, and exhale when the body is pushed up, so that the breathing rhythm is consistent with the movement rhythm.
Finally, breathe naturally. When doing push-ups, don't try to force your breathing style, but relax naturally. When you take a deep breath, you should feel the breath completely enter your lungs. When you exhale, you should feel relaxed, and the exhaled air will naturally flow out.
In short, the correct way of breathing can improve the effect of push-ups and reduce fatigue during exercise. When doing push-ups, take a deep breath, keep breathing in step with the movement, relax and breathe naturally.