For the basic practice of pushing focus, we simply move back from the page or screen, until the image just barely begins to blur. This is our blur horizon, which we can change by using differential prescriptions (close-up specific glasses). Using active focus, we work to continually increase the distance to the close-up object.
This practice is all you need, along with reduced strain, to improve your vision.
There are a number of other practice to help with reducing myopia, which we discuss at length in the Vision Improvement Courses (and the forum, and other posts here).
A recently posted installment discusses some of the finer points of pushing focus. In it, we discuss different ways of refining this practice, in our quest to increase the distance to the screen. While not technically necessary, providing the body with unexpected stimulus tends to bring improved response. While I strongly advocate vision improvement as ongoing habits, giving your eyes work that they are not always used to, can add some additional good stimulus.
If you are subscribed to the Vision Improvement Course, head over to Installment #62 to find out more about the two directions of pushing focus, and their respective benefits.
Enjoy!