Your health might not be your main focus, you should get at least one hour of excise a day at this day and age. It depends on who you are to see if others feelings are more important to you, but just try to get in a lot of excise a day, and your friends are important at these days, but once you go to collage you reset with friends and popularity and once out of collage you may not have very many friends. I am not saying to ditch your friends but I don't know what type of friends you have, but if they are not the friends that you want then try to focus on other things like your health.
No. Since you don't have to think about your heart beating, which is made of cardiac muscles. <span />
Check the side of the neck as well as the wrist, try hearing for any breaking from the infants mouth as well as checking to see if the infants stomach is moving.