You can use Siri on Apple Watch to start, pause, and stop workout. Using Siri on phone will only open the apple watch app for you automatically.

Here is what you can say:

e.g.

-start running using gymatic

-start free form workout using gymatic

-stop workout using gymatic

-pause workout using gymatic.

workout supported are :

- free form workout

- running

- cycling

- elliptical

- stair stepper

- rowing

Pausing workout are only for cardio workout.