Mindfulness Training is an empirically validated method to increase the strength, endurance and flexibility of your mind.
It's like going to the gym for your brain - through repeated practice of simple exercises, you will develop greater mental attention, focus, concentration and emotional balance.
“The faculty [ability] of voluntarily bringing back a wandering attention, over and over again,is the very root of judgment, character, and will. No one is compos sui [master of himself] if he have it not. An education which should improve this faculty would be the education par excellence. But it is easier to define this ideal than to give practical directions for bringing it about.” -William James, Principles of Psychology (1890)