It is often said that getting down to students' eye level is important when delivering praise or sanctions to students. This can often be interpreted as leaning over a student rather than standing above them or sitting down next to them. I often observe teachers who think they are at the student's eye level but are actually still demanding that the student looks up at them. I prefer the student to be looking down at me; teachers who do this know that crouching down lower than eye level is not weak but assertive and confident physical language.
Source: here