The foreground extension allows the app to run in the foreground. If YOU close the app it will not remain active; this is NOT a way to make a background app. When you manually close the app; it will stop running. 
When the Foreground (KAS) service is activated: the app continues to count your steps when and after the device screen closes.
This appears to be Label4. I assume calories is determined by 0.045 times Label2.Text (the number of steps taken. Calories is not there in your app because you did not tell your app to place calories in Label4 by using a join Block.
How to build a Foreground Pedometer is described here
It works; your fitness app does not yet work.
The pedometer control is documented in Pedometer