60 sec. Flat stomach office chair roll out workout @ https://www.youtube.com/watch?v=u8SY_MTVFzA
7min Flat stomach office chair roll out workout @ https://www.youtube.com/watch?v=bshx6cBmukc

More six pack ab exercises @ https://www.youtube.com/playlist?list=PL23F539B624BB43DF...

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