Larry is taking a walk in the park. The pollen in the air makes him sneeze constantly. What line of defense is his immune system exhibiting?

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.

A) stable development i believe

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