This article advocates the use of the target language at all times in the classroom at all levels of language instruction. While addressed specifically to middle school and high school teachers, the article suggests an approach to language instruction that can be implemented for students of all ages. After recounting how the author's experience teaching high school students convinced him to teach exclusively in Spanish, the article then addresses possible objections to the instructional method, presents topics to cover when teaching Day 1 of Level 1 of a language, and discusses ways to help students thrive in an all-target-language classroom.