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Do you really know gym ball ? 4 key point you shall knowDo you really know about gym ball ?  How to choose the ball you need ? 

4 key point 1/  SIZE Which size exercise ball you should buy  ?  
Exercise balls come in industry-standard sizes: 55 cm, 65 cm, and 75 cm. These sizes indicate the height or diameter of the ball when fully inflated. 
Exercise ball sizes are designed to ensure ideal ergonomics and body alignment for specific body heights. Please use this Balance Ball exercise ball size chart as your guide to choosing the right size ball for your height:
 
The sizing chart above is a guideline; as you become an experienced Balance Ball user, you may find that you're able to use a larger or smaller ball with successful results.
 
2/  THICKNESS How thickness you can choose ?  
Thickness and ball weight is not equal but it's close relastionship.   
Different weight and thickness, with reference to different use.   
for example, yoga ball for 9cm-30cm, the weight from 100g- 300g .  
Water ball  
Where :  swimming pool , beach , entertaiment park....
Who:  Kids
Waht:  the best weight around 100-200g
Yoga ball 
Where :  yoga center, fitness center, pilaties center
Who: dancer, teacher, trainer
What:  the best weight  around  100-200 g 
*yoga ball need more soft and light* 
Gymnastic ball 
Where : professional race  
Who: trainer , teacher and professional player  
Waht:  the best around 320g  
3/  TEXTURE How to identify  texture ?  
there are two texture for gym ball, antiburst ball and classical ball. Antiburst ball  surface is particle, classical is flat surface, a little sticky but high adsorption when you hold a ball.  Not easy to slipout from your hand.   

4/  TYPE 
How many type you can choose ?  
There are two types for gym ball.   

 
by PP 2020.07