Can I Merge or Split Recordings?

Yep! When editing an activity you'll see some advanced tools towards the bottom.

Merging

If you recorded multiple activities at the same resort in any one day, the option to merge will be active. Tap that row to combine multiple recordings into one activity. You won't be able to merge activities from multiple days or multiple resorts.

If you recorded via the Apple Watch, activities automatically get merged for you for the same day at the same resort.

Splitting

If for any reason you want to split an activity, tap that row and you'll be able to select the time at which you'd like to separate the activity into two.