https://techcrunch.com/2021/02/01/apple-fitness-is-adding-airplay-casting/

A week after introducing Time to Walk, Apple has released another software update aimed at expanding its Fitness+ footprint. With today’s arrival the developer seed of watchOS 7.4 and iOS 14.5, the company is adding a new feature that will make it possible to stream workouts to an AirPlay enabled TV – with some caveats.

Users can stream audio and video the company’s subscription-based fitness app to AirPlay 2-enabled sets. That’s a nice addition for those without an Apple TV and users looking to bring the service on the road with them via compatible hotel TVs (when people start staying in hotels again).