New answers tagged lower-back
5
The erector spinae muscles (iliocostalis, longissimus and spinalis) extend the back.
In the back extension exercise they work isometrically to maintain an extended back against gravity that tries to flex the back.
In the back extension exercise the glutes (gluteus maximus) and the hamstrings (semitendinosus, semimembranosus, and biceps femoris) works ...
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