Which of the following choices best describes the relationship between intensity and time in a successful exercise program?
a. as intensity increases, time should increase
b. as intensity decreases, time should decrease
c. as intensity increases, time should decrease
d. intensity and time should never change

The answer is C. As intensity increases, time should decrease. This is because the harder you work your body, the harder it is to sustain that level of effort. Putting in all your effort for too long a time period can be overly strenuous and exert all your energy, potentially leaving you with problems post-workout. 

Hope this helps!

Maybe it is yoga , stretches, push ups, sit up etc

Ibelieve the answer is microorganisms within the body develop mutations, so d.hope i you out : )