Custom Unity Assets of various individual gym workout equipment.
I highly recommend using "OptimizeCUA" plugin from trety for CUA's with collisions that misbehave and "UnityAssetVamifier" if you didn't know.
I shall be making a custom scene as well...
Smith Machine & Weight Bench


Credits: CC BY - Tytan
Barbell & Weights


Credits: CC BY - Tytan
Mini Dumbbells

Credits: CC BY - MHKstudio
Small Weight Rack

Credits: CC BY - Tytan
Gym Bench Chair

Credits: CC BY - MHKstudio
Step-Up Box

Credits: CC BY - TF7