BodyPump by LesMills is available at all Goodlife Fitness locations. And they have a similar class at all Extreme Fitness locations called Body Blast,which is basically the exact same class.

If you dont have a Goodlife, or Extreme close by, there are a number of local and international gyms that offer classes like this one. It's basically a 60 minute strength training workout to tone and build your muscles, with a cardio component. The focus is high reps, with low weight, and a high constant heart rate.
LesMills is a fitness company based in Australia, and is #1 in group fitness in the world! Constantly paving the way with new and progressive exercise routines.

I fully endorse their classes, and urge you to try one if you have a membership at Goodlife, or Extreme. Even if you don't have a membership, you can go online, and often get a promo for a few free classes. Just print it out and take it to your nearest club. Try it with a friend for support. You wont regret it, trust me!