Some of the most popular stores that you can upload your app are the following:
Apple App Store: The Apple App Store is the official store for iOS devices, such as iPhones and iPads. It offers a wide range of applications, games, and other digital content for Apple users.
Google Play Store: The Google Play Store is the primary store for Android devices. It provides a vast collection of apps, games, movies, books, and more for Android users.
Amazon Appstore: The Amazon Appstore is an alternative store available for Android devices and Amazon Fire tablets. It offers a selection of apps, games, and digital content, including exclusive Amazon features.
Samsung Galaxy Store: The Samsung Galaxy Store is a dedicated store for Samsung Galaxy devices. It provides a variety of apps, themes, games, and other content specifically designed for Samsung users.
Huawei AppGallery: The Huawei AppGallery is the store for Huawei and Honor devices. It offers a diverse range of apps, including popular international apps and locally developed apps.
These stores provide platforms for developers to distribute their applications and promote apps (like a fitness app), as well as and allow users to discover and download apps that suit their needs and preferences. Please note that the popularity of app stores may change over time, so it's advisable to refer to the most recent information for the current popularity status.