According to the university of minnesota extension you should use a bigger sized exercise ball.
Exercise ball for sitting at desk size.
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Use a 26 inch 65 cm exercise ball if your desk is the industry standard height of 30 inches 76 cm.
What size exercise ball is best for sitting at the desk.
Tighten your abdominal muscles and straighten your back.
Choose the right fitness ball for your height and weight.
If you are of average weight and you are under 5 3 160 cm you should choose a 55 cm 21 7 inch diameter exercise.
Measure your current chair and aim to have the diameter of.
If you re 5 feet 6 inches to 6 feet 2 inches then you ll need a 26 inch ball.
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So while for exercising purposes you would use a 45 cm ball if you are 5 feet tall for sitting at a desk you should use a 55 cm exercise ball.
Inflate the ball until you can sit on it with your feet resting flat on the floor and your legs at a 90 degree angle to the floor.
Additionally choose a ball that is 4 inches 10 cm taller than the height of the chair you re replacing because the ball will deflate once you sit on it.