Why long reining is bad for the horse when done wrong

After studying long reining I think I have found some guiding points that can be helpful to avoid doing it wrong. The most scary part was that I couldn`t find pictures of long reining done right. Pressure on the reins is a short cut - pitfall - trap, that will give intimidate results in the form of a horse curling the neck and hollowing the back. Anna from OneHorseLife however, shoved another way and she is offering a long rein course as we speak. I`m not saying it`s impossible to do right just very, very hard 😆