By using them for personal use ?
Decrease in school populations.
Hoped it helped!
That would be 3! hope this helps!
7% is recommended by the American Heart Association
The correct answer to this question would be the last one - Finding ways to increase physical activity to burn calories and increase heart rate. However, this question together with the answer is quite controversial because it's really questionable whether young people actually also do start doing this much more and they consider advertisments to be a positive influence on their life.