Selecting the correct size exercise ball for you to use is determined by sitting in the correct exercise position: Sit on the exercise ball with your feet flat. Your hips and knees should form a 90-degree angle with each other. This is called the 90-degree rule for sitting. It is the correct exercise position for using your ball.
Guidelines for determining the appropriate exercise ball size for individuals who exercise in a sitting position: The ball size is determined by your height, weight and intended exercise position (sitting, lying on your back, standing, etc.). For example: if you are 5’6” tall and weigh 250 lbs. You would best use a 65 cm. ball. However, if you are 5’ 8” tall and have very short legs you would want to try a 55 cm. ball.
If you happened to purchase a ball bigger in diameter than these guidelines you can simply not inflate your ball as much. For example if you purchased a 65 cm. ball and are only 5’ 3” tall, fit the ball using the 90-degree rule in sitting. If your exercise ball is under-inflated, the ball will not be as firm, but you will continue to reap the benefits of the ball.
How to Select the
Correct Exercise Ball Size
| BALL DIAMETER
|| USER HEIGHT
| 20-25 cm. ball (8-10 inches)
||For non-sitting exercises requiring a small ball
| 30 cm. ball (14 inches)
|| Children 1-2 years old
| 42/45 cm. ball (16 inches)
|| 4 ft. 10 in. tall person
| 55/52 cm. ball (21 inches)
|| 4ft. 11in. to 5ft. 3in. tall person
| 65 cm. ball (25 inches)
|| 5ft. 4in. to 5ft. 11in. tall person
| 75 cm. ball (29 inches)
|| 6 ft. tall person & taller
Exercise Ball Sizing Chart
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