The process of creating a custom fitness app using AI is simplified with platforms like Bubble, which offer tools to generate and iterate app features without coding. Initially, it's crucial to clearly define the app's unique value proposition, target audience, and core functionalities, such as workout tracking or social sharing, to distinguish it from competitors. The development involves utilizing AI-generated templates, followed by refining data structures, user interfaces, and logic workflows to ensure a tailored user experience. Testing and iterating are essential steps before launching, allowing for adjustments based on user feedback. Bubble facilitates this process by providing a visual editor for both web and mobile platforms, enabling developers to design, test, and deploy with ease, and offers resources and community support to enhance app development.