Expanding your prospective is primarily a right brain function. You don’t have to wait for a life jarring event (like a near death experience) to start you thinking about what it is that you are going to do starting today, the first day of the rest of your life. A proactive functioning individual will begin visualizing now where they want to be in the future in as much detail as possible, with as much emotion as can be imagined; involving all of the senses of the body that can be brought into play.
In short; what one is doing with this kind of detail rich imagination is living the experience in their mind as if they are wide awake; there in reality. Most of us can do this with regard to past events easily enough. But proactive folks can do this with the images they foresee themselves being a part of in the future, as well.