The aim of this essay is to provide an overview of how Existential Therapy is fundamentally different from every kind of psychotherapy, including existential psychotherapy. Existential Therapy is no kind of psychotherapy. Confusing the practicing of the two can harm people and thoughts. Existential Therapy is therapy for existence, whereas psychotherapy is therapy for life, a remedy for the problems of living. The adequate distinction between life and existence is an issue that shamefully has gone unaddressed in existential philosophy, existential psychology and research, and existential psychotherapy. This essay describes the main differences between life and existence, and then takes a look at what is healthy for existence versus what is healthy for life. What is found to be most unhealthy for existence is metacarnalizing, recoiling from carnal limits. Metacarnalizing is a primary existential reversal. Existential therapy unreverses existential reversals. Existential therapy unreverses metacarnalizing. Existential therapy essentially de-metacarnalizes. The issue of metacarnalizing and de-metacarnalizing is absolutely alien to all forms of psychotherapy for life. The essay is followed by an appendix, "An Existential View of Physics," which mainly describes the metacarnalizing basis of physics throughout its history.