Enter now to be one of 10 lucky Shape readers to win a Danskin Core Ball Plus (a $45 value; think your standard stability ball, but better). This tool, which helps you switch up your ab routine, comes with a balance ring for additional support, as well as resistance bands for a more challenging ab and upper–body workout. Learn new moves from the illustrated poster and inflate the ball anywhere with its convenient high–speed pump. Good luck!

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