I've been here.. really good place with good trainers..
JABMMA
Impakt can offer great training whether you want to try boxing or Muay Thai (also offer Brasilian Jiu Jitsu, Kyokushin Karate, Kickboxing plus kids and teen classes) as all of their trainers are very well qualified as well as being professional fighters themselves.
Packages of personal training are available as well as monthly memberships which include personal training, use of all the gym facilities plus unlimited classes. No need to sign up for a year's contract.
Located in Central on Queens Road, Wings Building right at the bottom of the Mid Levels escalator.