This unit describes the performance outcomes, skills and knowledge required to plan group water-based exercise sessions designed for participation by mixed ability groups, or by groups that predominately comprise a particular profile, for example, older people. It requires the ability to account for the participation of individuals from specific population groups and of diverse abilities, and allow for modifications that can be made during instruction.It covers skills for evaluating and improving sessions in response to participant and instructor feedback, noting that sessions might be delivered by self or others. Skills for instructing group water-based exercise sessions are covered in a complementary unit.Water-based exercise sessions may be conducted in indoor or outdoor pools, with or without equipment. They are most likely to involve music. Sessions could combine or specifically concentrate on cardiovascular, resistance and flexibility exercises. This unit does not apply to the planning of hydrotherapy or rehabilitation sessions.This unit applies to aqua exercise instructors who use discretion and judgment when planning sessions to meet diverse participant needs. Aqua exercise instructors practise in settings with pools, such as fitness facilities, gyms, and leisure and community centres.The skills in this unit must be applied in accordance with Commonwealth and State or Territory legislation, Australian standards and industry codes of practice.No occupational licensing, certification or specific legislative requirements apply to this unit at the time of publication.