I feel that Doing BB hack is better for u because you use these Stabilizers muscles and the Machine hack is just for Iso.. So why even do the machine if you are not incorporating more muscles? [plus the machine is so much easer to left heavy! let me know what you folks think!
Erector Spinae
Trapezius, Middle
Levator Scapulae
Trapezius, Upper
Erector Spinae
Trapezius, Middle
Levator Scapulae
Trapezius, Upper