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Old 08-21-2006, 07:55 AM   #5
Roger Harrell
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Join Date: Jun 2004
Location: San Rafael  CA
Posts: 2,318
In a weighted back extension you can get more of a whip than in a weighted glute ham situp (dependant on how you're doing the weighting and how flexible your shoulders are). This makes the back extension a bit easier when weighted, so it may be more of a mechanics thing.
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