Sivan Health and Fitness Balance Ball Fit Chair Base with Ball & Pump

Update: After two weeks of use, I still like this Sivan balance ball chair with no back. I solved the sore bottom problem by sitting a little further back on the ball. Much more comfortable. I still have had no incidents of feeling like I am going to fall off. I keep all 4 wheels locked, and the surface of the ball is not slippery. I have the ball filled to 65 psi and it does not seem to have lost any air in two weeks.After reading many reviews, I selected this Sivan balance ball chair with no back. The company was very responsive to my request for a piece missing from the box with a broken seal. I suspect I got a chair that someone else returned, but the Sell Below Cost company offered the best price I found, were quickly and accurately responsive, and included an apology for the missing piece and an offer to help if there were any more problems. Love doing business with a company with that type of service and attitude. The original order was received quickly, and the replacement part followed quickly within a couple of days while the ball was sitting at room temp and getting the first fill of air. I love that all 4 wheels lock. At my age, it is critical to avoid falls, and I think 4 locks helps. I have not had any trouble with falling off or feeling like I might fall off. With the wheels locked, I am able to move around a little and reach where I need to reach with no extraordinary efforts. Initially, I did not put enough air in the ball. The low air was perfect for my height to the ground with 90 degree angles at the knees, but I felt too low for my office desk and felt none of the movement advantages others described. I added air from a compressor and used 65psi as my cutoff. The ball almost doubled in size! I like the way it sits much better, but it is too high and I use a stool or I exercise calves while not using a stool. I choose to use the ball higher because I feel the "balancing" effect is there with the extra air, but not with the lower air. The whole assembled chair is also light enough for me to pick it up and put it outdoors on my deck, my favorite place to work! My only complaint is that my 'bottom' gets sore, kind of like riding a new bicycle seat but more spread out. The soreness is only after I have been sitting awhile, and does not continue after I get up and move around. I am hoping the soreness goes away completely as I use the chair more often and for longer periods. Plus, the pain forces me to get up and take a break, which is a huge plus for circulation. I tend to forget the lengthy time stretch I am sitting, so forced breaks are a plus. I am taking the advice of others and attempting to gradually extend time on the ball. I have had no more back pain than I have in regular office chairs. I recommend this Sivan balance ball and chair base for economy, quality, and the exercise-while-sitting purposes for which it is intended. I doubt I will ever do other exercises on it, because of the chance of falling. I hope I can benefit from the balancing movements others have described while using it as a desk-work chair.

This is very similar to the 'fit chair' also sold on Amazon. The ball appears VERY SMALL (much smaller than standard 55 cm ball), but it does put you at the near perfect height to sit at a normal work desk and access a keyboard on top of the desk. I'm a 5'5" female and it puts me just about at the perfect / comfortable height. Assembly was simple and the ball it comes with seems pretty heavy duty. I've been bouncing and scooting all over my office and it hasn't lost any air yet (it's day 2 so far.. will update review later if needed). For the price, I think it's a great chair. The reason for only 4 stars is that the casters have locks on them, and I am constantly hitting them with the backs of my feet (and locking them). It's a minor annoyance to have to bend down and unlock them when I want to 'roll' my chair. I'm thinking about intentionally breaking the locks off as I don't see any reason why I would ever need to lock the wheels.

Pros: easy to assemble and not too many parts. Sturdy. Ball pump works well.Cons: I specifically bought this product because I knew some of the other ones were too tall for someone of my 5'3" stature. However, the ball on this is way too small for me when using as an office chair. The base was a bit scratched up when I opened it.

I got this to help with my posture post knee operation. I will be using this also to help lift my leg up and later to use as office chair. overall good for my 6'2 250lb frame. It does shrink a little over time and you do need to pump it up. I pumped to the max on day 1 and let it contract since I knew that it will due to (1) being new and (2) air contracts and expands on temperature. The ball that it came with is not the greatest, but is still decent and good for daily use.The only other con is that I tend to step on the wheel lock more often than want to. I guess that's user error...Update Jan 29, 2015. I have not used this ball much since the initial review other than prompting my leg up and occasional hamstring pulls as I was still recovering. I returned to work today and sat through half a day when I noticed that wheels were not moving. I thought they were locked but turns out that the frame caved in making the wheel lock in. Amazon is not accepting exchange or returns. The unit did not last one solid day. 3 of the 4 sides caved in as it's hollow in the middle of the construction.

*****FOR THOSE PURCHASING FOR OFFICE/BUSINESS USE*******I did not purchase this ball to workout with, I purchased it because I sit in a chair all day at work and I have lower and upper back pain due to an auto accident. Putting it together took me about 10 minutes and was very simple. No extra parts!!!!!! Sitting in a chair all day was continuing to hurt my back and created bad posture and I needed a fix. I tried adjusting my chair at work and standing etc and I just could not find a way to get my back pain to go away while sitting at work. Well I found the solution with this chair. It almost forces me to sit up straight and does it comfortably and that is the main thing. I am finally comforatable while sitting all day at work, my back does not hurt at work and I feel better overall. Living with back pain and not taking any meds because I am a diabetic can be difficult but this chair has helped me tremendously and I am very grateful.

I've used this for some time now sitting at my desk and can highly recommend it. I bought the risers too as needed more height to be right for my desk and my position. I'm an IT and recommend to my clients who benefit from dynamic seating due to sensory processing issues.

I use this for periodic use (.5 - 2 hour max) at a time. I'm a fairly tall person (6'3") and after reading reviews that stated it was a bit small I was initially worried but after receiving the product I found it forced me to keep my posture at all times. Great for anyone who is concerned with ergonomics, health and fitness!

Easy to use

Artived 2 days after I placed the order. Sturdy base and really nice quality ball. Very similar Le to assemble. I am very pleased with this purchase. Highly recommend.

Love this stool. I am a massage therapist and find it to be perfect for working around the massage table. Also great when demonstrating strenches to clients.