The first thing that comes to mind when developing fitness apps is the cost of fitness app development. Although freelancers indeed charge lower than an app and web development company, the quality and confidentiality of your fitness apps are at stake. You can never be sure whether they divulge details of your fitness apps to others or are even serious about working on your fitness apps.
https://www.appsrhino.com/blogs/why-is-appsrhino-best-in-developing-fitness-apps