Galaxy Watch 6 & Watch 7 have over 100 workout modes with various custom settings. You can choose any exercises for your daily fitness session including HIIT workouts. Still, if you want to set up interval training on Galaxy Watches, then you can also do it. You can use custom training to add your specific goals and targets. You have to open activities from the given list to enable the training.
To do this, start a workout by running or cycling on the Galaxy Watch 6 or Watch 7 series. After that, you will see the Setting icon, tap on it. Here tap on Target, and enable the option. Now scroll down below to activate the Interval training options. You can also pause your workout when you finish the target. More options may come to Galaxy Watch in other updates. The option is available for all the workout modes on Samsung smartwatches in the Samsung Health app.
For Galaxy Watch Ultra, you can use even more workout modes, specifically built for it. It includes exercises in running, swimming, and other high-intensity workouts. On a regular Samsung watch, you will find all the necessary modes that you use on a daily basis.