I believe the answer is C: exercise burnout
The reason I say this is because one doesn't give their body enough time to recuperate. They in essence wear their body out.
Independent variable I believe is the correct answer. Since that is what is being changed.
<span>Hi,
Why is the potential for health problems increased when you exercise in polluted air?
</span>b. you inhale more air through the mouth when exercising, which keeps the air unfiltered.
You should hold stretches for 15 seconds.