Apollo Health & Fitness is located in the famous Apollohal in Amsterdam-Zuid. It is a fun but small gym for a sound workout. The current instructors and physical therapists can advise you well, but if you want to train independently, that is not a problem. The space is compact and neat, but the light makes you feel very spacious. At this location there are no group lessons, at Apollo you get 'pure' fitness.
And get access to 403 gyms and studios in Amsterdam with one sports membership.