They pay of a group fitness instructor should be dependent on number of students you attract to their class. If you are a great instructor then you are an asset to the club and you should be compensated more.
At www.FriendsBFit.com we keep a very small % of the revenue earned thus if you have 20 students per class and you charge $10 per class you will take more more than $150..
How do we do this, we are an online gym where we have built the technology where you can conduct a live group fitness class right from your home, so there is no commuting. also you can have clients from all over the US. Contact me if you are interested at [email protected]