APPLE HEALTH SETTINGS
In NSD Swimmer app, choose yes if you would like to sync with Apple Health.
Choose the data you would like to sync with Apple Health.
If you choose not to sync with Apple Health (step 1), you can sync at a later time by going to 'Settings' > 'My Info' > and enable 'Data from Apple Health' in NSD Swimmer app.
Open the Apple Health app on your iPhone.
Tap the 'Activity' icon located under 'Health Data'.
Choose Active Energy, Swimming Distance, Swimming Strokes, and Workouts as your 'Favorites'.
You have successfully synced with Apple Health.