Have you tried listing everything you think relates to the database, then removing the ones you don’t like, then grouping them in a way that makes sense to you or users of the database?
Certification types, access to bodybuilding books, bodybuilding trainers, ease of super sets, free weight ratios, ratings from heavy lifters, etc.
Try everything, make a list, narrow it down to the items needed for proper function and your business perspective (safety, legal, etc).
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solved BodyBuilding Club database, which entities are most important [closed]