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An ideal fitness ball size lets you sit on the ball with your knees at about a 90-degree angle and feet flat on the floor.
Some generally accepted guidelines for choosing a ball size are:
- 45 cm diameter: Under 4'8''
- 55 cm diameter: 4'8'' to 5'4''
- 65 cm diameter: 5'4'' to 5'10''
- 75 cm diameter: 5'10'' to 6'4''
If you are on the cusp of one of the sizes, stand next to a ball and see which size is at or just above knee level.