Fitness is a gateway drug because if you do fitness consistently, you will get the results that you're after. The man or woman who gets up every day and goes to the gym can develop discipline by doing it even if they don't feel like it. And so we know that if you're willing to put off immediate gratification,If you're willingto go to the gym consistently, you're going to build some serious discipline. We also know and science has proven over and over again that when you're working out consistently, your body is pumping out two very important happy hormones, endorphins and dopamine.