The principle of the frontal plank: lie down on your tummy. Put your elbows below the shoulders and lift the hips.
Maintain the position fro 30 to 45 seconds.
Suck in your tummy as much as you can. The more you suck in that tummy, the flatter is will be.
Do this series 3 times. And give yourself 30 sec. between each series.
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