- How does the cardiorespiratory system function?
- What are some ways that you can improve your cardiorespiratory system?
https://archive.org/details/physicalfitnessc0000dieh/physicalfitnessc0000dieh
https://www.youtube.com/watch?v=VWamhZ8vTL4
https://www.youtube.com/watch?v=sh5DZU2eVxk&feature=youtu.be
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