Product Description : This heavy-duty ball features tough, dura-wall construction and offers true slow deflate up to 350 LBS., making it the ideal ball for weight training applications. 55cm is recommended for for heights ranging from 5' 0 to 5' 7" i have been using my spri stability ball for 6 years. it is so much better than any i have used in health clubs- much sturdier, does not lose inflation...its versatilty is phenominal. it serves as a bench for free weights, is superb for ab work, and is a comfortable and ergonomically correcct chair at my desk. over the years it has been deflated and re-inflated dozens of times easily with the [included] pump. several times i misplaced the plug, and the spri company cheerfully and quickly sent me [free] replacements.. a definite 5 star product!. I purchased a ball for $10 from Wal Mart and didn't feel it had any stability and was very flimsy. The gym I use trains with the Spri brand so I thought this would be similar if not the exact ball. The quality was great, but unfortunately this is not the size I am used to hence the 3 star rating.I am 5'5' and the recommended size is 55, but the 55 in my gym and the 55 I am looking at are 2 different sizes. I am sending this one back and ordering a 65 instead. I am not sure if they have a different product line that they use for professionals, but I am very disappointed.This ball inflates to roughly double the size of a beach ball, and when seated you aren't high enough off the ground to do many of the moves effectively. Forget doing bridges, you might as well do them on the ground for all the height you get. Same excercise ball as the ones I use at the gym and in my fitness classes. I've tried other ones that were flimsy and wobbly, but this one is the best.
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