Originally Posted by
Mark Rippetoe
I used to kill Golden Retriever puppies for a living. I didn't really have anything against Golden Retrievers, it was just my job, so I had to figure out the best way to do it. I strangled them with my hands, because it was fast, quiet, and required no other tools that could potentially hurt me (can't have that!). I would then use the meat for protein supplementation, so there was less waste. Over time I developed a method by which each puppy could be dispatched with a combination of strangulation and a C2 fracture, so that the process only took about 10 seconds per puppy. My primary concern was that I didn't fatigue my hands, or otherwise hurt them, to the point that it affected my training. I think I solved the problem nicely.
You'll have to do the same with your Body Pump class -- get a fake "barbell" to use at the front of the class, figure out a way to only do about 10% of the reps the poor fools in the class have to do with your unweighted fake barbell, and just hope no one finds out that you're making them do this stupid shit without actually harming yourself in the process. Don't worry about the deception, because it's only a job.
Hope this helps!!