STABILITY BALLS

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With the proper use of the SPRI stability balls, you can improve your posture, balance, flexibility, core strength and coordination. 
The stability balls can be used to challenge individuals of all ages and 
fitness levels, and has many different applications including sports 
conditioning, rehabilitation, and pre/post natal training. 
General Guidelines for choosing the size of Xercise Ball that is 
right for you:

45cm = under 5ft. tall 55cm ball = 5' to 5'7" , 65cm  = 5'8" to 6'3" 
75cm = over 6'3" tall