If you purchased an In-App feature, e.g. the full version of the Six Pack App or the Premium Membership, it might happen, that the extra feature is not anymore available for you later on or not activated yet.
If thats the case, you are able to restore the In-App purchase.
To do so, go to the settings of the app, choose "Runtastic" and then "Restore In-App Purchases".
Make sure to use the same Apple account you used when you purchased the extra feature the first time.