I have trained in a commercial gym for 30+ years.

When you have trained that long you typically find increasingly more effective exercise variations.
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If I could go back in time I would have done an entirely different exercise routine 30 years ago.
Here’s a video of 8 exercises that another experienced fitness trainer wishes he would have done years ago.
I really need to try his variation of the lat pulldown!
That looks incredibly effective.
One thing I wish I would have known about in the beginning is a high tension technique for lifting weights for muscle definition… “High Voltage Lifting”.
I have written a detailed post about it here:

Gain Strength Without Size: High Voltage Lifting
Use the approach I describe in this blog post on any of your favorite exercises.
It is a quick way to tighten and firm up lagging muscle groups.
Cheers,
-Rusty Moore
As a former fitness coach to fashion models, I can teach you how to increase muscle definition without adding size.
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