Mobil app for fitness startup

I am looking for an experienced mobile app developer to create a mobile app for my fitness startup. The app should be available on both Android and iOS devices and it should include features such as Workout Tutorials, Activity Tracker and Ads for monetization. This is an exciting project and the developer should be enthusiastic about creating an innovative, engaging and user-friendly app for our fitness startup. Our goal is to create an app that effectively helps motivate and drive our users to reach their fitness goals. The developer should have expertise in designing and coding both Android and iOS apps as well as have knowledge of best practices for user lifestyle-focused app development.