Stability balls, which are also called fit balls, Swiss balls, physio balls or exercise balls, are a versatile and affordable exercise tool that will help you develop your core (abs, lower back, oblique) muscles. The balls come in different sizes, typically between 55-75 centimeters when inflated. The size you should choose depends on your height.
Height
Diameter when inflated
5'7" or shorter
55 cm
5’7" - 6’2"
65 cm
Taller than 6’2"
75 cm
You should be able to sit on the ball with your knees at a right angle and thighs parallel to the floor while your feet are flat on the floor.
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