I love the biomechanic terms! Because they are a formal way to describe something. They are precise, unique and well documented in literature. On the other hand, too frequently in gyms are used inappropriate terms that generate confusion and ambiguities.
Just last week, a fitness trainer, that claim to be a posturologist, tried to explain me that the bench press arch is bad and that my back would have disintegrated. And I have not found a way to explain my reasons, just because we did not have a common vocabulary.
I think that is a good way to communicate, without invent strange and fantasy terms.