Do I have an ab circuit for you! ???Fair warning - this one is much tougher than it looks. (But really, aren’t all circuits like that? All you need for this one is a stability ball and, uh, the courage to finish. What’s the deal with those big bouncy balls taking up space around the gym? Stability balls (also called exercise balls, balance balls, Swiss balls, or fitness balls) are more than just fun to sit and bounce on—they’re a great way to improve strength, cardio endurance, and balance.

Do I have an ab circuit for you! ???Fair warning - this one is much tougher than it looks. (But really, aren’t all circuits like that? All you need for this one is a stability ball and, uh, the courage to finish. What’s the deal with those big bouncy balls taking up space around the gym? Stability balls (also called exercise balls, balance balls, Swiss balls, or fitness balls) are more than just fun to sit and bounce on—they’re a great way to improve strength, cardio endurance, and balance.

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