Lesson 4 of the “Mermaids Lesson Plan” focuses on finswimming technique and best practices. It aims to educate participants about the benefits of finswimming for cardiovascular fitness, muscular endurance, and overall health. The module includes instructions on how to properly fit and use fins, goggles, and a snorkel, emphasizing the importance of proper technique and equipment for safe and effective finswimming. It also covers basic techniques such as body position, dolphin kick, and arm strokes, with a focus on individualized feedback and correction as students practice these techniques. Inclusion activities, like mentorship programs, are integrated to build a sense of community and skill-sharing among participants. The module is designed to enhance both finswimming skills and social inclusion.