Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: dimensions?
Document: this product was recommended by my physical therapist team after my back surgery l5 s1 fusion. i still have lots of issues with sitting and cannot remain seated for more than 20 minutes without serious pain. the dyna disc engages your core muscles and makes use of your stomach muscles so it takes pressure off your back muscles. i have one that i keep a little more than half inflated and one that i keep full.
this item was recommended to me by my niece who is a physical therapist, and by the way she is the best. I worked with this while she gave me regular exercises to do near the end of.my therapy. I now own this product and whenever I feel a twinge in my back I immediately use the dyna disc to relieve any discomfort I have. My husband also uses it when he has a backache.
so i highly, highly highly recommend this to anyone with back problems or sciatica. it will help you get more of the time you love crafting, drawing, computing, etc. even makes car rides more bearable. of course nothing is going to eliminate the discomfort all together, but you would be amazed at what this little thing can do for you.
my daughter in law did not like this product, it is too much like the items used for ADD kids
and i keep the full-blown one at home for use in every chair i sit in. and together they are the ultimate in relief. i will warn you that if you sit on it for a few hours in a day it does provide substantial relief, but can cause spasms in your stomach muscles if they are weakened, as mine were.
We use this for my daughter (2 1/2 years old) as a sitting disk. It is part of her physical therapy and is used to strengthen her core as she has low muscle tone. She sits on it 30 minutes a day when she gets to watch her one T.V show for the day. I have seen great results and it has been fantastic for her!
Use this at home to gain stability after hip or knee surgery. Ask your doctor or therapist when the time is right.
This just came and is definitely not aquamarine like in the picture - it's a deep kelly/hunter green. Haven't used it yet so I can't review the quality, but a little disappointed that I didn't get the color I wanted.
The product came promptly, and I am pleased with it. However, I am NOT pleased when I am told that I WILL also receive something (in this case the instruction manual) whicn is NOT sent as promised.
The disc does what it says but it took about 10 minutes worth of vigorous pumping with the small supplied pump to inflate the disk (which then disinflated over the next few days). If you already own a more powerful pump this may not be an issue for you.Also, my disc arrived in a simple cardboard box without any written materials (including the promised exercise sheet).
Answer: no