The Secrets to Perfect Sit-Ups

Sharpen your six-pack with these key tricks for making sit-ups work harder for you.

[Stewart, Brett] on . *FREE* shipping on qualifying offers. 7 Weeks to 300 Sit-Ups: Strengthen and Sculpt Your Abs, Back, Core and

7 Weeks to 300 Sit-Ups: Strengthen and Sculpt Your Abs, Back, Core and Obliques by Training to Do 300 Consecutive Sit-Ups

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