Shape of Your Lungs

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.
Playing
Melissa, 30, struggles to breathe at high altitudes. "I've had issues with the altitude since about 2003," she says. "I notice it when I'm hiking. I notice it when I'm snowboarding. So, really, at higher altitudes it becomes much more of a problem. It feels like someone's sitting on my chest."