Developing the core / 
National Strength and Conditioning Association ; Jeffrey M. Willardson, editor 
 - Champaign, IL :  Human Kinetics,  2014 
 - vii, 215 p. :  ill. ;  25 cm. 
 - Sport performance series .
 - Sport performance series .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780736095495 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Exercise<br/>Abdominal exercises<br/>Abdomen--Muscles