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This intense workout for flat stomach standing up will shrink your waistline in no time.
It's so effective because it doesn't just focus on your ab muscles. It also targets your leg muscles, allowing you to burn a ton of calories.
One of the reasons this workout is effective is because it has short rests so make sure you stick to the recommended rest duration.
Some of the exercises in this workout will even help improve your balance.
Enjoy the intense workout for flat stomach standing up.