People don't realize that when they 'throw out' their back, it's often because of weak abs. These muscles are essential for lower-back strength and good posture.
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About Sylvester Stallone
Sylvester Stallone was a contemporary American actor and filmmaker. Sylvester Gardenzio Stallone is an American actor, painter and filmmaker. In a film career spanning more than fifty years, Stallone has received numerous accolades, including a Golden Globe Award and a Critics' Choice Award, as well as nominations for three Academy Awards and two BAFTA Awards. Read more on Wikipedia →