You can create a customized app for your athletes using various platforms and tools. Here's a step-by-step guide to help you get started:



1. Determine the purpose and features: Clearly define the goals of your app. Do you want to provide video tutorials, exercise routines, or both? Will there be a progress tracking system or a community forum for athletes to interact? List down all the features you want to include.



2. Design the user interface: Sketch out the app's layout and user flow. Consider using wireframing tools like Sketch or Figma to create a visual representation of each screen.



3. Choose a development platform: Depending on your technical expertise and budget, you can choose from different development options:

   a. Native app development: Build separate apps for iOS (using Swift) and Android (using Java or Kotlin). This approach offers maximum performance and native device features but can be more time-consuming and expensive.

   b. Cross-platform app development: Use frameworks like React Native or Flutter to build apps that work on both iOS and Android platforms. This approach saves development time and effort but may have some performance limitations.



4. Develop the app: If you have programming skills, you can start coding the app yourself. Otherwise, you may need to hire a developer or a development team. Provide them with your design mockups and explain the desired functionality.



5. Implement video and exercise content: Integrate a video player component into your app to display instructional videos. You can use popular video platforms like YouTube or Vimeo to host your videos and embed them into the app. For exercises, create a database or use a content management system (CMS) to store and retrieve exercise details, including text, images, and descriptions.



6. Test and refine: Regularly test your app on multiple devices and get feedback from your athletes. Fix any bugs, optimize performance, and make necessary improvements based on user suggestions.



7. Publish your app: Once you are satisfied with the app's functionality and stability, submit it to the respective app stores (Apple App Store and Google Play Store) for review and approval. Follow their guidelines and requirements to ensure a successful submission.



8. Maintain and update: Continuously monitor your app and address any issues or bugs that arise. Regularly update the app with new content, features, and improvements to keep your athletes engaged.



Remember to consider data privacy and security measures when handling user information within the app.