'These balls have many names - yoga ball, stability ball, exercise ball - but no matter what you call them, they are one of the most useful pieces of fitness equipment that anyone can have around the house.   Whether you are using your ball as a weight bench, doing core exercises on it, or just sitting on it like a chair, they are a great addition to your fitness arsenal.  The 6 fun exercises in this video are: - Jack Knifes - Dead Bugs - Pikes - Torso Rotations - Leg Raises - Push-ups' 

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