Ski Tracks connects to the Health App. On Ski Tracks go to Settings > Health > ON. This allows your Ski Tracks data to be shared to the Health App.
When you 'Save' a track in Ski Tracks the activity data is saved to 'Workouts'
To view your Ski Tracks data on the Health App select Activity
Select Show All Data
Select an activity to view the data
Your workout is shown as Snow Sports
Scroll down to 'Total Active Energy' to show calories burned