A substance free lifestyle would be a lifestyle where you are healthy and you do things for yourself and you care about yourself. You dont let negative things into your life such as drugs and alcohol, and keep a positive and open mind. You filter through things in life such as the movies you watch and the music you listen to, in order to keep a healthy and positive mind.
you have to eat the right amount of calories till you full if you dont you body will go on shut down meaning it will hold the bad calories. than do a well balanced work out so that way you fill good. Dont go on things like crash diets you body will react badly and will affect you later in your years