Although people were initially doubtful and even apprehensive about the purpose smartwatches would play in modern life, the Apple Watch was able to carve out its own niche that its competitors are now trying to catch up with. That niche focuses on monitoring and measuring wearers’ health with the need for dedicated, expensive, and bulky medical equipment, and the latest watchOS 7.2 update brings yet another feature that might not be a lifesaver but will hopefully improve lives anyway.

Ever since watchOS 7, the Apple Watch has already gained the ability to determine whether the user has low cardio fitness, a.k.a. cardiorespiratory fitness.
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https://www.slashgear.com/apple-watch-gets-cardio-fitness-notification-in-watchos-7-2-15651295/