AM I not goog enough?

You are good enough.

Don’t let anyone tell you otherwise.

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.

1.controls blood flow2.controls oxygen flow3.carries oxygen rich blood to veins