Because most real-life foreign language speech is naturally unpredictable, spontaneous speech should be practiced in the foreign language classroom. Student teachers of English as a foreign language (EFL) may benefit from practising methodology for spontaneous speech practice. This article reports the findings for a study into EFL student teachers' experiences with using improvisation activities, exploring the relevance of improvisation activities for spontaneous speech practice. The data include semi-guided texts and reluctant speakers' interviews. The findings showed that improvisation activities facilitated spontaneous speech practice and strengthened speaking confidence through enjoyment. The 'spontaneous speech mindset' enabled participants to explore linguistic and creative boundaries. The study showed that application of improvisation activities is an excellent method for spontaneous speech practice in EFL teacher education.