Everyone must remember that if you are unhappy with something then it is your responsibility to “speak up” . This also refers to your fitness group instructor. Unlike a personal trainer, they are overseeing several clients at once.  It is next to impossible to cater to every single clients’ needs and especially wants.  I constantly hear several clients complain about another trainer saying that they were not loud enough or they didn’t push hard enough.  The “class ” was easy and so on and so on.   One must remember that it is your responsibility to inform the trainer prior or after the class with feedback. “Not saying you have to be rude” but ” Hey Lisa could you turn the music down because I can’t hear your instruction.”  Don’t forget in the end they are only human.