I was watching the live broadcast tonight, as I wasn’t able to get on the live one, and when you were discussing the building muscle and showed a live example, it reminded me of Charles Atlas and his exercise system he developed in the 50’s. He never used weights or any other thing to gain his incredible physique and strength.
He called his movement and system, “Dynamic Tension”. I remember it from when my older brother bought Charles Atlas system in the early 60’s and for some reason that name stuck with me. I did find his course online a long time ago and had forgotten about it until recently when you showed your exercise.
Here is a screenshot of his one page showing the “dynamic tension” that you describe.
Can you imagine what he would look like if he had your Cellerciser? LOL
Thanks again for a quality product.