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Most adults suit either a 55 cm or 65 cm exercise ball. If your hips sit below your knees, move up a size. If you cannot control the ball during exercise, move down a size or use a more stable option.
If you plan to use a ball for pain, rehab, posture or workstation support, a physiotherapist can help match the ball size to your body, goals and exercise program.
Exercise Ball Size FAQs
What size exercise ball should I use for my height?
Most people between 155–173 cm use a 55 cm exercise ball. People between 175–188 cm usually suit a 65 cm ball. Taller users may need a 75 cm or 85 cm ball, depending on leg length and how they plan to use it.
How do I know if my exercise ball fits?
Sit on the ball with your feet flat on the floor. Your hips should sit slightly higher than your knees, and your spine should feel upright and relaxed. If your knees sit higher than your hips, the ball is probably too small.
Should I go bigger or smaller with an exercise ball?
Go bigger if you are using the ball for sitting, especially at a desk. Go smaller if you need more control during exercise. Between sizes, your purpose matters: sitting needs height, while exercise often needs stability and control.
Can an exercise ball help posture?
An exercise ball may help posture by encouraging upright sitting and gentle core activity. However, it should not replace regular movement breaks, workstation setup or strength work. For desk comfort, also consider a full ergonomic workstation assessment.
Can I use an exercise ball for back pain?
Some people use an exercise ball for gentle movement, core control and supported back exercises. However, back pain has many causes. If pain worsens, spreads into your leg, or affects daily function, seek guidance before progressing exercises.
How firm should an exercise ball be?
The ball should feel firm but still give slightly when you sit on it. If it collapses heavily under your weight, it may be under-inflated or too small. Always follow the manufacturer’s inflation and safety instructions.
When should I avoid using an exercise ball?
Avoid using an exercise ball if you feel unsafe, dizzy, unstable or unable to control your balance. You should also seek advice before using one after surgery, a recent injury, a fall, or significant back or pelvic pain.
Is an exercise ball better than a chair?
An exercise ball is not automatically better than a chair. It can be useful for short posture or movement breaks, but long sitting still needs variation. For desk use, alternate between a supportive chair, standing, walking breaks and targeted exercise.
