Air which we breath enters the lungs through the?

Iwould say being around others who are not drug free is the wrong step because your peers are likely to influence any new or past habits

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.