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Proper ways to work the powerball
In the last few years, powerballs have gone from a novelty to a gym staple. You always see people working out with them, and you might even have used one for the occasional sit-up or push-up. But those enormous plastic bubbles have more versatility than you could imagine, and are an excellent exercise tool.
"Using the ball with free-flowing movements sculpt a great upper body, arms and abs,"...
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