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Wtf
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Abdominal crunches work the rear shoulder muscles?? I thought they work the abdominals!
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ehhh
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are u farting lol
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is it more effective if you go faster? + if you purposely tighten your abs, is that more effective too? thanx for the vid :)
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no, it's more effective to go slowly.
brassbando 3 years ago 6