Understand how your lungs work

Your lungs are like natural air pumps. When you breathe in, your lungs fill up with air, taking in oxygen which then gets absorbed into your blood. This oxygen-rich blood is pumped around your body by your heart. When you breathe out, your lungs get rid of carbon dioxide, a waste gas your body doesn't need. So, it's like an efficient exchange system—bringing in what you need, getting rid of what you don't. Simple as that!

References 2. How Do Your Lungs Work? (youtube.com).