it works the erecter spinae. which is the opposing muscle to the rectus abdominis or the 6-pack muscle. those two muscles are what move the spine back and forth. this is the muscle that everyone neglects when they spend countless hours weekly training abs they neglect the opposing muscle. which over time creates a severe muscle imbalance making lower back injury in the future much more likely.
What does the exercise ''back extension'' do?opera sheet music
extends your back
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