Analyze the harmful effects of certain substances and environmental hazards such as environmental tobacco smoke on fetuses infants and young children

premature-birth,
- malformations and low birth weight
-Sudden infant -dead
-The acute respiratory infections, chronic bronchitis and inflammation or ear infections
-asthma
-Of cardiovascular damage
-Development of dependence on nicotine in
children

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.