There is no automatic sync feature for now. It will be added in one of the feature updates.
However, there is a workaround for this. You can create an iCloud backup manually on your iPhone and restore the same backup on the iPad. This way you will have the same data on both devices.
If it doesn’t work, you should check your iCloud settings on both devices. Open the settings app, go to iCloud and click on iCloud Drive option. Check if the toggle on Fitness Point is on.
First of all you need to activate the option for calorie counting in settings tab. You need to start the workout timer at the beginning of your workout and log all sets as usual. Calories will be counted automatically for each set.