So far its been very nice, the only complaint i would have is that i can't reorganize equipment, delete it or store it somewhere.
Will there be like an album option where you can take a pic of specific gym goers to track progression?
Glad you're enjoying it!
The next update will let you pack, move and sell placed equipment so reorganizing your gym will be much easier.
For tracking gym clients' progression, I don't really plan to go further with that (unless I find a way to get better models with shape keys, or just a lot more models). But I will be adding hireable employees at some point: you'll be able to train them and they'll gain visible physical progression over time, with a screen to track their stats and body changes. Models will update the next day once certain stat thresholds are reached.