If you're talking about the lumbar and throacic erectors their primary function is in keeping the torso erect under load and in most cases this means picking up and/or carrying heavy objects, both bar shaped and odd-shaped.
Just take a look at powerlifters or strongmen - the really strong ones have huge spinal erectors.
You probably could get something out of flexion based exercises (i.e. weighted hyperextensions/ rounded back good mornings) but I think heavy lifting is going to the cornerstone of any programming.


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