I am totally guilty of this.
Early in my career I wanted to have the new and cool exercises to stand out from the other trainers.
I found out the hard way that complicated is not cool.
My first session, I had four ladies in their 40s doing Rear-Foot-Elevated Split Squats with their feet strapped into a TRX.
It was a disaster.
They kept falling and getting angry with me and I had no idea what to do.
Rather than swallow my pride and regress I insisted that they do the exercise, and man did I look like an idiot!
Luckily I had the great mentor Justin Grinnell watching me and letting me make the mistake.
Immediately after the session, he told me that in big groups, it's always better to go simple and coach the hell out of them.
He was right.