I have some clients where their gym has terrible to no cell service or WiFi. They love the app, however they have to take screenshots of the workout before going to the gym and don't ever log their sets, reps, or resistances.

Would be game changing if a client could download a workout for offline mode, which would allow them to view videos, or at the very least, log their sets, reps, and resistances while also seeing at least what those numbers were from one previous workout. I understand if all of an exercise's history can't be downloaded, but at least some recent data so they can use the app as intended while in their workout. Then, once they're back online, that workout data gets uploaded to the cloud and synced with the rest of their profile.