The MySwimPro Fitbit app is only available for Fitbit Ionic and Fitbit Versa.
1. Open the Fitbit app on your phone
2. Tap on your connected Fitbit device on the top of the screen
3. Tap on Apps
4. Select All Apps at the top of the screen
5. Select the Search icon and search for MySwimPro
6. Tap on the MySwimPro app and tap Install
7. You're all set!
See also: MySwimPro Fitbit Features