Could you please add support to the iOS app for Landscape orientation? I believe this is relatively painless to implement, at least compared to creating a tvOS (AppleTV) specific app (which would be nice as well).
Landscape orientation support would allow iOS users to Mirror their phone display to AppleTV and have an actually legible display (a TV) to look at. There is just no way I can do a workout using only my phone - the display is WAY too small. In Portrait orientation, Mirroring to AppleTV is just terrible to look at on a TV which is obviously in Landscape orientation.