Eat healthy and do stretches. The best thing a 12 year old to do. You're too young to do anything super serious imo
⇒ aids the performer in preparing physiologically for exercise reducing the chance of joint and muscle injury.
⇒ prepared the body for exercising the blood flow to the muscles allowing them to loosen up which can raise the flow of oxygen to muscle cells.
Damage to reproductive system
There are actually several consequences to a child whose mom smoked while pregnant. With the choices given here, the best one would be a lower birth weight and short stature. Other things that can occur from this are babies are more prone to asthma and the odds are tripled for the risk of SIDs.
No because you have to be 18 and have a valid state id