so im having trouble with this problem and i tried to find out what it is but i still don't know the answer.

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.

What? are u trying to do a genetic test?

True, this is when someone has mood swings