Talk about how breathing with your nose while running is effective for the zone 2 cardio and redo your response

Nasal breathing can help you regulate your running pace and stay near a Zone 2 effort, but it is a guide—not a definitive test of Zone 2.

• Zone 2: A moderate effort where you can keep up a conversation without pausing or gasping; nasal breathing is another rough way to gauge the effort. 1
• When nasal breathing gets difficult: Ease your pace and see whether you can return to comfortable nasal breathing. But needing to breathe through your mouth does not, by itself, prove you are beyond Zone 2: breathing needs vary with effort, and the nose can limit airflow as intensity rises. 2
• Weekly target: Aim for 150–200 minutes of Zone 2 cardio per week. 3