Power Systems VersaBall Stability Ball

I bought this because my physical therapy clinic uses one. It is a well made product and seems to be very durable. However it was shipped in a generic heat-sealed plastic bag without the tape measure and air pump adapter. Fortunately my bicycle pump came with an adapter that fits. I used a piece of string, a Sharpie marker, and some math to rig up a replacement for the missing tape measure. As others have noted it is not possible to inflate the ball to its full volume on the first day. Pump it as large as it will go on the first day and let it rest overnight. The next morning you will be able to inflate it to the appropriate size. Every couple of months it needs to be pumped up again. It is difficult to remove the plug and quite a bit of air is lost when you do it. There is no convenient way to add a few pounds to "top it off". A possible solution would be to add a needle hole like the one used in basketballs.

Very quick delivery. I did get both and air pump adapter and the plug as indicated. The stability ball tape measure was not included as indicated but I have a cm tape measure so I thought no worries. The ball is marked as a 65cm however after 24 hours it inflates to well over 65cm so I think it may be marked the wrong size. At 85cm it looks and feels perfect.Other than that there is no "plastic" smell and it seems to be good quality and sturdy. I am going to inflate as if it is an 85cm since otherwise it is obviously not inflated correctly compared to other stability balls. Just watch the size. I think the tape measure that should have come with it would have helped, possibly theirs is better suited than mine. cm should be cm though right?

Same thing others have said -- there is something up with the manufacturing on this. The logo on the side looks worn and like a stick-on, aka, it is entirely possible we are being shipped "counterfeit" balls, because I bought this ball on recommendation from my gym and use theirs every day. What I got in the mail from Amazon is NOTHING like those balls. It is MUCH smaller, and using their own blow-up guidelines, it does not expand to the full size. Based on everyone's comments, I ordered one size up -- I should buy the 55 given my height, but I literally bought the 65 expecting to have to deal with some sizing issues. The instructions say to bow up to 50 (on the 65) and let it expand over 24 hours to 65. Never happened. It sat at 50. So I blew it up to 55 and waited another 24 hours. Nothing happened. When you sit on it, it feels mushy, even blown up to 80% as advised (well, now actually up to something more like 90%). This ball is the size of the ball that fits inside those gymball chairs -- it is not NEARLY the size you need to do proper exercises on. Just a note that I probably should have removed the ball stand under the attached photo, but the ballstand adds around 2-3 inches of height to the ball, and that's a standard size roller. Considering I basically bought the "medium" ball this thing, sitting at 55 right now, is still not where it needs to be on its own. And I worry that if I manually inflate it to 65 I will be dealing with "potential burst" issues. Sending it back. I think I will go direct to the manufacturer for this.

Much better product than a previous one i purchased. The texture makes just feels better and makes the balls better to handle than the super smooth slippery balls. Slippery balls are normally fun but not in this case.

Apparently, these balls need to be sized to a person so that when you sit on them, your knees are at a 90 degree angle.Measure a good chair or put your adjusting desk chair to the right height and measure it in centimeters and inches.My gym teacher told us that VersaBall was sticky and that helps to hold a grip when you are trying to stay on it.I also plan to use it at a desk to keep my core muscles strong. I got a good pump so I didn't have to depend on abasketball pump and I will be using this as my private gym to do crunches and will search YouTube for exercises.

Versaball was easy to blow up to desired level. Offers stability for core workouts and yoga. Highly recommend!

The stability ball is a nice addition to my home work-out equipment! I use alone or with my trainer for various exercises. I would recommend this product!!

Appears to be well made, 1 week in and so far so good as a desk chair replacement