Back Row Short/Lengthen

In this video I am sitting upright, hips under me and doing a back row. This is an example of working the back first in its shortened state (also weakest) The science is beyond contention showing fatigue a muscle FIRST in its shortened with state, then progress into its lengthened state (strongest) Notice all I did was slide my hips back to elongate the muscle. In both positions I am using a full range of motion