Mobile app for fitness startup

I am in need of a mobile app for a fitness startup that I am running. The main goal is to provide users with an easy and efficient way to track their workouts. For this purpose, the app should be developed for both iOS and Android platforms. Ideally, there should be an efficient calorie tracker within the app for users to keep an eye on their calories consumption. Finally, it would be great if the app also provides social sharing and integration with wearables such as fitness watches and bracelets. If you think that you have the necessary skills and experience to take on this project, please reach out.