What kind of microphone do you like for instructing group fitness classes?

And if you don’t like the headset mic, I would attempt to try other mic set ups before buying one. I found lapel/clip on mic set ups to be unreliable when I really get moving.

I use a headset, but I clip the transmitter on the back of a ball cap on my head. I gather up the wire and make secure. Then I don’t have the wire flopping around or end up laying on the transmitter.