From Marguerite Ogle,
Your Guide to Pilates.
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Definition: Fitness balls are large balls, 55cm - 75cm, that are used in all kinds of fitness scenarios from physical therapy to yoga, Pilates, and general exercise. Also known as exercise balls, balance balls, stability balls.
Read more about using and buying exercise balls for Pilates in Pilates Fitness and Exercise Balls

Also Known As: exercise balls, balance balls, stability balls, pilates balls, yoga balls,

Examples: You can get a real core challenge by holding the fitness ball between your ankles as you do The Hundred.