What do you mean by "three ones" in correct writing posture?

The posture of writing and reading is "three ones", that is, "the eye is one foot away from the book, the chest is one punch away from the desk, and the hand is one inch away from the pen tip".

The first two "Ones" in the "Three Ones" may have been advocated in China for a long time. The latter "one" probably began when the hard pen was used as a writing tool. At school, teachers also focus on explanations and demonstrations; Usually, it is also strict, so that students can develop good writing and reading habits.

Executive summary:

"Eyes one foot away from the book, chest one punch away from the desk, hands one inch away from the pen tip" is the standard requirement of writing and reading posture. However, in actual teaching, this standard is required by the municipal standard, because teachers are not sure about its length, which makes many students develop bad habits of reading and writing posture. Are "one foot" and "one inch" commonly used in our daily life? Don't! The "inch" in the "three ones" means "the same size"-that is, the length of each person's own limbs. The posture of writing and reading should be "different from person to person" and "different from hand to hand", and the "three ones" should be changed to "eyes are one arm away from the book, chest is one punch away from the table, and hand is one (middle) knuckle away from the pen tip".