Can Apple TV gen 1 use apple fitness
Can I use Apple TV gen 1 with new fitness app
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This is a first generation Apple TV:
Are you sure that’s what you have?
If so, then no. Apple Fitness, cannot be used with it.
Apple Fitness requires an Apple TV HD, or 4K running tvOS 14.3 as explained in the support document you came from.
link-> Identify your Apple TV model - Apple Support