If you try to take in air very slowly, you’re actually restricting the flow in and most likely inhaling through your mouth. You’ll notice that your lips are partially closed and pursed, or your teeth are close together. You might even hear air get caught where your lips and teeth meet, creating the hiss of air being sucked through a tight opening. This is not diaphragmatic breathing. When you’re doing it correctly, the air flows silently in through the nose and races into your lungs.
