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Nearly everyone has four of them — broad flat muscles, known as obliques, that attach the rib cage and the pelvis on each side of the body and, until recently, have not really been part of the sports lexicon. But now they are. The muscles are particularly important to baseball players, who use them to rotate their bodies as hard as possible to throw a ball and swing a bat, and increasingly those muscles are being injured and putting players like Tampa Bay’s Evan Longoria on the disabled list.