3. What causes a limited amount of blood and oxygen to reach the different parts of the body? A Fatty deposits that clog blood vessels.
B One side of the heart sending blood to the lungs.
C Exercising and doing normal daily activities.
D Eating a well balanced diet.

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People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.