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How strong is your core? Find out with this ultimate ab challenge<p>Ripped abs are reason enough to add some core moves to your routine. But a strong torso can also give you the foundation you need to lift more weight with less risk of injury. "Crunches alone won't get the job done, though," says Todd …
SAN FRANCISCO, CA - SEPTEMBER 09: Dick Costolo of Twitter attends TechCruch Disrupt SF 2013 at San Francisco Design Center on September 9, 2013 in San Francisco, California.