ISBN 9781612430492 books & textbook
7 Weeks to 300 Sit-Ups: Strengthen and Sculpt Your Abs, Back, Core and Obliques by Training to Do 300 Consecutive Sit-Ups
Ulysses Press /2012-04-03 Paperback / 152 Pages
isbn-10: 161243049X / isbn-13: 9781612430492
