Do you need an Apple Watch to use fitness app
Do you need an Apple Watch to use the fitness app or will it not track your movements without the Watch ? Will my phone app work without the Apple Watch
iPhone 13
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You can use the Fitness app 
to track your daily activity, set a move goal, see your progress, and see your movement trends over time—even if you don’t have an Apple Watch. See:
Track daily activity in Fitness on iPhone - Apple Support