Honestly I've never tried because trainer time is when I put my watch on the charger. By the time I'm done and out fo the shower it's back to 100%. Instead, I use the Wahoo armband with Zwift and it works great.

It will not pair with Zwift. You can connect other devices to the Apple Watch (such as a bluetooth HRM) but not the other way around currently. The Apple Watch will not broadcast its built-in HR to Zwift. You can however pair it this way (which to me is a hassle):
https://support.zwift.com/...tors-Hk0MimWlS#Apple

I would suggest buying an inexpensive bluetooth HRM and don't bother with the headache.

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"see the world as it is not as you want it to be"

Yes it will. There’s a Zwift app for the Apple Watch which records HR. I haven’t used it yet but it’s there.

Details here https://support.zwift.com/...monitors-Hk0MimWlS#/

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I ride:
Cervelo - P-Series/R3
GT - Sensor Carbon Expert

Supporters - Flo Cycling, Mount Bikes

Thats the link I posted....it works via iPhone first to pair it....which I suggested is not optimal and even om iPad is seems to have gotchas so I suggested the inexpensive hrm...especially sine the post implies the connection isn't stable.

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"see the world as it is not as you want it to be"