Fitness app
I paid for the fitness app but I do not see it on my Apple TV. What do I need to do?
You pay for a subscription service of content, not for the app. The app (on various devices) is just a delivery method.
You get a month free trial to see how you like it, before you start paying.
Devices you can use with Apple Fitness+ - Apple Support
To see Fitness+ on the TV screen, you will need Apple TV HD (4th generation) or Apple TV 4K (5th generation) with software tvOS 14.3 or later. Verify that you have a supported model, with up-to-date software. Identify your Apple TV model - Apple Support
Work out with Apple Fitness+ - Apple Support
- Work out on Apple TV
Follow the steps as outlined to connect your Apple Watch, and start a workout.