This study aimed to examine in-service training content of rhythmic dance instruction based on the teaching anxiety and concern of an in-service teacher with no experience in dance. Specifically, the following two research objectives were set: first, to investigate the teacher’s teaching anxiety and concern before the in-service training for rhythmic dance instruction and what the teacher expected from the trainer, and second, to elucidate the teacher’s teaching anxiety and concern about teaching rhythmic dance after the implementation of in-service training and what the teacher wanted from the trainer. The results emphasize the importance of the following three points in the in-service training content. First, provision of movements that enable students to understand the basic dance movements through imitation; second, introduce examples of immediate language teaching practices of movement related to space, time, and weight devices in response to students’ realities; and third, suggest methods of teaching movements that capture the rhythmic characteristics of music.