The sun can have both positive and negative effects on our lives.

True. The sun is a source of vitamin D, it reduces the incidence of depression, and it is the source of energy for plants to make their own food. It can also cause burns, heat stroke, and certain types of cancer.

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.

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