 Breathe into a bag. Breathe into a bag. Breathe through a straw. Except for who's got a straw. What you do is pursed lip breathing. So you breathe in through your nose and out through your pursed lips like you're breathing through a straw. You fake the straw. And that creates enough back pressure to get your carbon dioxide levels up. And now once you've done that, you do that like three or four times, now you can make it up the stairs.