I am Body Pump certified and teach it a couple times a week for 6 years. The training is held over a weekend. You are not certified after the training! You must learn the 60 mins of choreographed material. You must then present the entire class to a live audieance while being video taped. The tape is submitted the Les Mills co. for assessment. They will determine if you are ready to teach or if you need more time, in which case you will need to resubmit a video.
I hope that helps. If you would like to chat about it my email is below.
As far as I can remember, once you learn their format, you must purchase their music and you can only teach at places that have the license.
Visit www.lesmills.com for more info.