Answer:
I can't see the text clearly my gurl
No, it's because we need to breathe. Your body needs oxygen. Air pressure has little to nothing to do with it as far as I know.
Answer:
Both tests test the endurance and strength of muscle, but they evaluate muscles in different areas of the body. The curl-up test is used for the abdominal muscles while the arm hangs test, as is said in its name, test the arm muscles.
Explanation:
