Slim Jim wrote:
How about doing some regular deadlifts, tough to beat them for back strength.
Regular DL’s work the upperback and middleback more than the lowerback.
Someone please correct me if I’m wrong, but I think the lumbar erectors have their origin on the sacrum and iliac crest, and insert on the posterior inferior ribs. Therefore, the lower spinal erectors cannot by themselves produce hip extension. They aid in many hip extension exercises by contracting isometrically, thus allowing for the mantainence an arched posture (preventing rounding of lower back) and thereby allowing for optimal leverage during many hip extension exercises such as squats, deadlifts, good mornings and back extensions (and even t-bar and bent over rows).
The only “true” lumbar erector exercise would be an isolation exercise which allowed only lumbar extension (and not hip extension), such as a rounded back extension off a swiss ball or glute ham raise apparatus, whereby the lumbar erectors are contracting concentrically and eccentrically.
However, it is difficult to provide an optimal load during these isolation exercises, and is more beneficial to perform exercises that allow for maximal loads such as deadlift and good morning variations, even though such exercises only produce isometric contractions of the lumbar erectors.
I’m not sure what your point is.[/quote]
His point is to show us how much smarter he is then the rest of us.