I would also want to know if this person approached you directly or if it is gossip. As a group fitness instructor, you will sometimes have to let things roll off you since you can’t please everyone. However, if you’ve heard something about yourself a few times that you think is true, then perhaps you can work on it a bit.
Good luck to you whatever you decide.
Is the feedback coming directly to you, or are you hearing gossip? Feedback given directly to you is a gift. Gossip, I take with a grain of salt.
What I mean by feedback being a gift is this. That member had two choices. They could simply stop taking your class or they could tell you what they’re having an issue with. Rather than just leave your gym or your class, they chose to let you know how they’re feeling.
Do you have to act on all feedback? Of course not. Sometimes the feedback is something you can’t change (I got a comment in the comment box once that I was too short!). Sometimes the personal characteristic is something you could change, but is part of your teaching personality so you will purposely choose not to change it. For example, I tell jokes in my group-ex classes. The people who attend my classes like it, or they don’t stay. But my classes are well sized and I continue to attract new members, so I keep this persona. If my classes were getting smaller or I weren’t attracting any new people, I’d consider changing, but that’s not happening.
It depends on the negative feedback. Sometimes we can’t please everyone and not all personality differences can be resolve. There will always be someone who has something negative to say about us (especially if we are teaching classes/groups). If this is happening frequently then you need to take a step back and see if there is anything you can do to fix the “issues”. If it’s one or two people who gave you a negative feedback then worrying about it too much won’t help you or make that much of a difference. You can always confront those who gave you the negative feedback and see if you can do anything to resolve it. Or you can talk to your manager/fitness director and maybe he/she can give you a helpful advice.