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Anatomy of the Back Muscles
Superficial (extrinsic) back muscles help you move your shoulders, intermediate back muscles help you breathe, and intrinsic ...
While it had a small engine (by 1960s standards) with fewer cylinders and a turbocharger, it was undeniably an impressive intermediate that brought back American muscle. For more on what is ...
If you’re craving some more intensity in your classes or you just want to challenge your body in new ways, the best ...