How to Use a Fitness Disc : Back Extensions Workout on a Fitness Disc

[tyciol]

I am disappointed that she does not mention the lattismus dorsii. They not only function to extend the humeri which is happening here to bear weight, but they are spinal erectors as well. Too much focus on the erector spinae here. In spite of the spinal extension, this is primarily a lat movement like a pullover. It has similarities to using an ab wheel.