If you have the Workout Auto-Lock option enabled, FITIV automatically locks the workout buttons for you to avoid pocket taps from accidentally stopping your workout.
To unlock the workout, simply swipe from left to right at the bottom of the screen. This action will unlock the buttons and you will then be able to complete your workout.
Please note that it is possible to disable this auto-locking functionality. Tap on the MORE tab and then scroll to the APP SETTINGS section and turn OFF the WORKOUT AUTO-LOCK option.
On Apple Watch, to complete a workout, simply scroll to the leftmost screen to access the settings. In the settings you can select to end your workout, and you are also given the options to SAVE or DISCARD the completed workout.