why don't we think about training our minds

Many of us are slaves to our minds. Our own mind is our worst enemy. We try to focus, and our mind wanders off. We try to keep stress at bay, but anxiety keeps us awake at night. We try to be good to the people we love, but then we forget them and put ourselves first. And when we want to change our life, we dive into spiritual practice and expect quick results, only to lose focus after the honeymoon has worn off. We return to our state of bewilderment. We're left feeling helpless and discouraged. It seems we all agree that training the body through exercise, diet, and relaxation is a good idea, but why don't we think about training our minds?