It is true but it could include other type of exercises.
I honestly feel everyone is different but me personally I deal with stress by breathing exercises. It feels good and it makes me get rid of my stress. I also take baths and do my breathing exercises in there as well.
I think its the United States
The first one should be "Fight or Flight". I'm not sure about the second one.
Young people are busy working out who they are and where they fit in the world. You might notice your child trying out new things like clothing styles, music, art or friendship groups. Friends, family, media, culture and more shape your child’s choices in these years.
Independence
Your child will probably want more independence about things like how he gets to places, how he spends his time, who he spends time with, and what he spends money on. As your child becomes more independent, it’ll probably mean some changes in your family routines and relationships, as well as your child’s friendships.
Responsibility
Your child might be keen to take on more responsibility both at home and at school. This could include things like cooking dinner once a week or being on the school council.