Can you change the length of the pool on an apple watch
Can i change pool length on my apple watch
Apple Watch Series 6
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Open the Workout app.
Scroll to Pool Swim or Open Water Swim. Use Pool Swim for laps in a
pool and Open Water Swim for swimming in places such as a lake or ocean.
Tap to start the workout or tap the more button 
to set a calorie, distance or time goal.
For Pool Swim, turn the Digital Crown to set the pool length.
This helps your Apple Watch measure your laps and distance accurately. Then
tap Start.
Wait for the three-second countdown. To skip the countdown, tap the screen.