Please choose the correct ending to complete the given sentence: Health: [header] How to improve your vision naturally [title] Find a pencil, and mark it somewhere in the middle. [step] Draw a letter, number or dot on the side of the pencil. For this exercise, you'll focus on the pencil and the dot as you move it toward and away from your eyes.

Ending1: [title] To start, place the pencil vertically in front of you, and draw a circle around it to represent the pupil size. [step] Move the pencil as far away from your eyes as you can. Ending2: Work from left to right, not side to side. Move this pencil a few inches (comfortably) in each direction, but don't accidentally mark it. Ending3: Pencil push-ups are reputed to correct double vision and crossed eyes, but it can't hurt to try them for other issues-it's free, painless, and only involves focusing and refocusing your eyes. [title] Hold the pencil in front of your face, at arm's length. Ending4: [substeps] There are many color pencils you can use, but there are two main colors used: a black and white, a deep black and a deep tan. The colors of these pencils differ depending on the subject you're focused on.

Answer format: ending1/ending2/ending3/ending4