The author wishes to thank Drs. Michael Dean, Shuji Ogino, and Jiirgen Fuchs and Ms. Beth Woodworth and Ms. Julie Bergeron for helpful comments. The content of this publication does not necessarily reflect the views or policies of the Department of Health and Human Services, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government. This review has been funded in whole or in part with Federal Funds from the National Cancer Institute, National Institutes of Health.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.