Best gyms to join? (Colombo)

Hi everyone,

I'm looking to join a gym in Colombo, I have been given a few options so far.
I've heard there's a gym on Jawatta road, high octane and inter trainers for classes. Just wondered if any one had any other recommendations? As I've never used the gym before I don't want anything to hard core! Maybe a few classes, a few personal training sessions and general working out.

Would be grateful for any help!

Hannah