Finding the best fitness apps for android can be difficult, especially if you’re looking for a free android apps. The most frustrating thing about browsing the app store on your Android device or iPhone is that almost every exercise app claims to be free, but comes with in-app purchases. However, once you install the app, you’ll realize that the in-app purchase is what unlocks the full functionality of the exercise app. The best exercise app may not be the same for everyone, but all of our favorites have a few things in common. First, the best Fitness Apps or health apps feature a wide variety of original exercise content for all different fitness levels..