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I did 50 butterfly sit-ups a day for a week — here's what happened to my abs

If I did 50 sit-ups in bed each day, how long would it take to grow a six pack? - Quora

Ab Exercises For Women

[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

If I did 50 sit-ups in bed each day, how long would it take to grow a six pack? - Quora