These are older Fenix watches, from 2017 and 2018 respectively, but they can still fit the bill if you’re focused on improving your athletic prowess. The base Fenix 5 is a rugged multisport watch with a heart rate monitor, GPS, sleep tracking and up to two weeks of battery life in its usual smartwatch mode. Step up to the Fenix 5X Plus and you’ll get a pulse ox acclimation sensor for high-elevation exercise as well as newer creature comforts like tap-to-pay and on-device music playback. They won’t rival the latest smartwatches in general functionality, but they don’t have to.

There’s also

Watch a Twitch streamer playing horror game du jour Phasmophobia, progressing in a tense esports tournament or perfecting a speedrun, and you might see their current heart rate on their feed. Garmin is offering broadcasters another way to layer that data into their streams with an Esports Edition of its Instinct GPS smartwatch.

The smartwatch uses Bluetooth to hook into a PC streaming tool called STR3AMUP!, which might be the worst name I've heard for anything in my entire life. Broadcasters can then display their live heart rate, stress and Body Battery energy level data on their streams.