Basic crunches can't flatten your belly. Abs are one of the hardest body parts to train. To tone your abs, you need professional and scientific core muscle .
Ab exercises. Build impressive "6-pack abs" with these movements.
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Get hep with your abs workout on your Android with Runtastic Six Pack Abs. instructional videos with adjustable difficulty levels, with a 10-week six pack plan,
For some strange reason I am not getting sound with this video. Not a concern with my computer, because I.