Stability Ball: Size matters

As some of you may already know, the stability ball is one of my favorite pieces of exercise equipment. I am often asked what size ball is best. I hope the following information is helpful....


When you are sitting on the ball, your legs should be at a 90-degree angle with your thighs parallel to the floor and your hips at the same height as your knees. However, there are some exercises you may do where a smaller ball might work better; if this applies to you, then you might want to consider having two different size balls.
In addition to size, inflation is a factor as well. A firmer ball will be more difficult to balance on, so seniors or people who might be deconditioned or overweight should consider using a larger, softer ball. Don’t worry, the ball is rated to support up to 660 pounds.
Here is a general size chart. Keep in mind leg length is more important than height.

Ball Size (cm)	Maximum Ball Size (in.)	Your Height
45 cm	17 in.	Under 5’
55 cm	21 in.	5’ – 5’ 7”
65 cm	25 in.	5’ 8” – 6’ 2”
75 cm	29 in.	Over 6’ 3”

There are many benefits of training with stability balls. Here are just a few:

• Promotes muscular balance
• Increases postural awareness
• Improves balance and coordination
• Allows you to work through a greater range of motion than you can with many traditional exercises
• Targets your core muscles
• Strengthens and tones your muscles
• Provides dynamic exercises for your entire body
• Strengthens weaker muscles
• Improves kinesthetic awareness and helps prevent injury
• It’s portable and inexpensive
• It can be used anywhere