The one in prabhadevi is straight no no .
You pay 9000 for 6 months and all you get is crowd and trainers who themselves are not in shape to train .
you again need to shed ?5000 for a personal trainer which is way expensive ( plus yiu have already paid monthly fee) .
They do have common trainers who are least bothered to take care of ppl . Overall experience is bad as they enroll lot many ppl without even thinking about how small place they have got .Join only if you can come off hours and workout by yourself.