How do I connect Apple fitness to Apple TV? Audio works, no video

Apple Fitness+ on the TV screen currently requires an Apple TV box or 4th generation or later, with software tvOS 14.3 or later.

AirPlay is currently not supported.

Devices you can use with Apple Fitness+ - Apple Support

Work out on Apple TV - Work out with Apple Fitness+ - Apple Support

Please refer to https://support.apple.com/guide/watch/set-up-fitness-on-apple-tv-apd54d380d15/watchos however it is also helpful if you Identify your Apple TV model because you may need to use Airplay if you have an Apple TV 3.