Is this a good video to help define core muscles?http://youtu.be/vkKCVCZe474 I've been doing this for the past three days no problem. I do it when I wake up and when I go to sleep. I already have a flat stomach and I'm skinny, I just want to know if this will help me get a nice six pack? With out supplements or changing my diet as well. Thanks. submitted by /u/Milsark23 [link] [comments]
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