Working on your body harder than usual in order to improve how it functions is formally referred to as what ?

Which of the following are examples of coordinate headings

When children are young and go to the doctor, the doctor will give them booster shots. this re-exposes the children to a dead portion of a disease to them build immunity.

Which of these example of a hereditary risk factor? smoking, eating junk food everyday, being a couch potato, having fair skin that is prone to sunburn