Subject: A killer lower ab exercise with no torque on the lower back...
You want six-pack abs? You need to work the rectus abdominis (the six-pack ab muscle) with focused tension...and, ideally, WITHOUT spinal flexion and torque on the lower back.
That's where this exercise comes in.
Nick Nilsson
The Mad Scientist of Muscle
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https://www.madscientistofmuscle.com/1-exercises/abdominal-exercises/incline-bench-single-leg-knee-raises.htm
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