The theoretical frameworks of a history of education and curriculum history were applied to provide an explanation for the findings pertinent to the individual and collective identities of the subjects of Physical Education (PE), School Sport (SS), and Health Education (HE). This chapter presents a critical analysis of the major themes derived from the presented curriculum histories. The first theme summarises the influence of political and socio-cultural factors on the evolution of the subjects in New South Wales (NSW) and Australia’s education history in the lead up to the final product of: a unified Personal Development, Health, and Physical Education (PDHPE) in NSW and Health and Physical Education (HPE) curriculum at a national level. This summary of the factors affecting curriculum developments in the subjects not only filled the gap of a combined education history of the three subjects, but it also made apparent and deepened an understanding on how the three subjects co-existed in the curriculum and signified the usefulness of the subjects working together to achieve a shared agenda. This first theme provided two additional and related key themes including: the interdependent relationships and ‘changing of the guard,’ and the subjects ‘cooperating to compete’ for status in the school curriculum. The key theme ’cooperating to compete’ embodied the sub-themes reflecting: the ‘overcrowded curriculum’, and the disputable reputation of ‘practical’ and ‘less academic’ subjects in a climate of high-stake national and international assessment benchmarks. The subsequent outcome of themes two and three arrived at the fourth theme reflecting a recent and untold history of the deregulation of SS traditions in NSW public schooling for the first time since the commencement of compulsory schooling in 1880. This chapter concludes by explaining that the subjects’ curriculum histories of the subjects evolved to adapt to changing conditions at significant points throughout history, and were found to dissociate or connect with one another to maintain or pursue an identity consonant with externally driven imperatives and or to uphold status quo in the broader curriculum. Consequently, the concept of the ‘survival of the fittest’ was at play throughout the individual and combined histories of PE, SS, and HE from 1880 to 2024.