Some people who write badly simply never understood what their teachers were talking about. And do remind them often that writing slowly is usually better than writing fast. How to sit Not everybody knows how to sit. It should allow your forearms to rest on the desk. Try to sit upright.
Bad posture can cause a lot of trouble.
Until it does, people usually don't think about it. The light should come from the left. Otherwise, your hand will cast a shadow just where you need to see what you're doing. Left-handed writers should of course have the light coming from the right. And don't sit cross-legged.