BusinessweekHow to Work Out in the OfficeFacebookXLinkedInEmailLinkGiftExpandKareem Black for Bloomberg BusinessweekFacebookXLinkedInEmailLinkGiftGift this articleContact us:Provide news feedback or report an errorConfidential tip?Send a tip to our reportersSite feedback:Take our SurveyNew WindowFacebookXLinkedInEmailLinkGiftBy Tracey AndersonSeptember 23, 2011 at 12:15 AM UTCBookmarkSaveLock This article is for subscribers only.You can work—or work your abs, quads, lats, shoulders, glutes, obliques, and lower back.