For those bros near Bayan Baru area, I heard Orient Fitness @ Krystal Point is good. AF is known for their incompetent admin/management.

Personally I'm a member at Fitness Studio in Gurney Tower. After office hours might be packed cos CF and FF which have closed down, many of the members transferred over here.

If you're looking for trainers, here is the best place in Penang. Very qualified, experienced and dedicated trainers.