This paper reports on mixed methods research that was part of a larger investigation into the impact of an inclusive, physical activity intervention programme on a broad range of variables including children's enjoyment of, and participation in physical activity, self-perceptions, physical self-efficacy and how this influenced their overall social-emotional health and well-being. A six-month intervention programme based on Traditional Indigenous Games (TIG) was conducted in a total of five schools with 235 children and their seven teachers, in Queensland, Australia. Student reflective surveys used a four-point Likert scale to collect quantitative data relating to enjoyment and inclusion, perceptions of ability and physical self-efficacy. Qualitative data were also obtained through teachers' anecdotal notes and post-intervention semi-structured interviews. Statistically significant differences across time were found for student enjoyment, inclusion, perceptions and physical self-efficacy and were supported by the teacher's qualitative data. Improvements in students' physical self-efficacy through inclusive physical activity occurred as a result of the positive experiences created by the TIG intervention programme. This study demonstrates the huge potential for the inclusive and cooperative approach foregrounded in TIG, to support the development of inclusive physical activity in schools which enhances physical self-efficacy and promotes the social-emotional health and well-being of children.