This paper reports on the informal, out-of-class activities of the K2 (Kanji and Katakana) gym that was conducted twice (once each in 2009 and 2010) over a five-week period in the Department of International Studies, Macquarie University. The primary objectives of this project were (1) to provide Japanese language learners at different levels of proficiency with opportunities to practise character and vocabulary learning skills and (2) to explore the efficiency of informal study on the learning of Kanji/Katakana and vocabulary in Japanese. A total of 17 and 9 students participated in the K2 gym in 2009 and 2010, respectively. In the gym, the participants practised Kanji/Katakana using worksheets, repetition sheets and sample sentence/translation sheets under the supervision of native Japanese-speaking postgraduate students. At the end of the fifth week, both participants and postgraduate student assistants provided feedback on the K2 gym activities. The feedback was predominantly positive. The project was significant not only for the Japanese language students who received individual feedback from native speakers in a non-threatening learning environment but also for the postgraduate assistants who gained experience supervising the gym in their interaction with the participants and made some very practical suggestions. Possibilities for future activities are provided.