Can I use Fitbod without an internet connection?

Yes! 

You can open and use Fitbod without being connected to the internet. Once you finish and log a workout, your workout data will be saved locally to your device. Once you are connected to the internet, the app will write your workout data to Fitbod's database for proper storage.

Important Note:

If you delete Fitbod from your device while your data is locally saved, that data might become deleted and will no longer be retrievable.