Lower Back Isolation Movements

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(isolation for lower back / lumbar spine)

lock-out hips / pelvis against the pad of the back extension machine
round the spine on the descent so the abdominal wall is closed as the bottom
while descending, imagine a hand or bar under the abdominal wall and crunch around it
come back up only until the body reaches a horizontal plane at the top

* to make this a little more advanced, add a twist on the ascent (alternate sides)