The pause feature used to be pretty buggy. It would attempt to extend your term end date appropriately whenever you resumed your subscription and it (unfortunately) failed to do so quite frequently.
After discovering that our payment processor didn't actually support our use case for their "paused" billing state, we decided to implement a credit-based system which grants 1 credit each week you're paused.
This means your next billing date never changes based on your pause date but you will be able to retrieve the exercises you've paid for.