Allergies are an overreaction of
W which system in the body?

Allergies are an overreaction of your body's immune system to a harmless foreign substance that enters the body, like pollen or animal dander. Substances that cause this reaction are called allergens. The job of your immune system is to identify foreign substances in the body and get rid of them.

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.