Apple iWatch Workout App
On the “Workout” App on Apple iWatch 5, can an activity be added for “SUP” (Stand Up Paddle boarding” watersport
Apple Watch Series 5
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There isn't a workout type for what you have mentioned,you could use the "Other" workout type,this is usually used when you can't find a specific workout type.
The other workout type measures time and calories burnt only not distance.