The chapter discusses the importance of flexibility in sports and fitness, emphasizing its role in enabling athletes to perform a wide range of movements safely. It highlights the complexity of fitness as a physiological characteristic and the need for reliable assessment methods to advise athletes on their ability to handle the demands of their sport. The chapter also introduces the "four principles plus scope" approach to medical ethics, which includes respect for autonomy, beneficence, non-maleficence, and justice, along with a focus on their application scope. This approach provides a common moral framework for healthcare workers to make ethical decisions, addressing issues such as informed consent, confidentiality, and resource allocation. The chapter concludes by discussing the practical implications of these principles in healthcare settings, including the challenges of defining the scope of moral obligations and the importance of balancing competing ethical concerns.The chapter discusses the importance of flexibility in sports and fitness, emphasizing its role in enabling athletes to perform a wide range of movements safely. It highlights the complexity of fitness as a physiological characteristic and the need for reliable assessment methods to advise athletes on their ability to handle the demands of their sport. The chapter also introduces the "four principles plus scope" approach to medical ethics, which includes respect for autonomy, beneficence, non-maleficence, and justice, along with a focus on their application scope. This approach provides a common moral framework for healthcare workers to make ethical decisions, addressing issues such as informed consent, confidentiality, and resource allocation. The chapter concludes by discussing the practical implications of these principles in healthcare settings, including the challenges of defining the scope of moral obligations and the importance of balancing competing ethical concerns.