To choose the correct size yoga ball, you should consider your height and weight, as well as how you plan to use the ball. Here are some general guidelines from various sources:
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If you are 5 feet (1.5 m) or shorter, you will want a ball that is 18 inches (45 cm).
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If you are 5 feet (1.5 m) 1 inch (155 cm) to 5 feet (1.5 m) 7 inches (170 cm), try a 22 inch (55 cm) ball.
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Get a 26 inch ball (65 cm) if you are between 5 feet (1.5 m) 8 inches (173 cm) and 6 feet (1.8 m) 1 inch (185 cm).
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If you are 6 feet (1.8 m) 2 inches or taller, you will need a ball that measures 30 inches (75 cm) .
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If you plan to use the ball as an office chair and your desk height is between 29 and 30 inches (74 to 76 cm), get a 26 inch (65 cm) ball. Choose a ball that has a diameter which is 4 inches (10 cm) larger than the height of the chair you are replacing.
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If you are 411" to 5 3", get a 55cm ball. If you are 5 4" to 5 10", get a 65cm ball.
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If you are under 48", get a 45 cm/18" ball. If you are 48" to 53", get a 55 cm/22" ball. If you are 54" to 510", get a 65 cm/26" ball. If you are 511" to 64", get a 75 cm/30" ball. If you are 64" and up, get an 85 cm/34" ball.
Its important to note that these are general guidelines, and the size of the ball you need may vary depending on how stiff it is and how much you weigh, as the ball will squish down when you sit on it. Additionally, as you become more experienced with using a yoga ball, you may find that you prefer a larger or smaller size depending on your fitness level and how you plan to use it.
