Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: How would these headphones hold up using them at the gym?
Document: I gave these to my granddaughter for Christmas, so she would stop using earbuds. She loves these headphones and just sent me a text that the are "perfect!"
Right out of the packaging these headphones had greta crisp and clear sound with a great voulume range. These headpohnes are very comfortable easy to adjust and for around $30 there unbeatable in price. The red is quite stylish and looks great. I would highly reccomend this product especially if you have been using earbuds your whole life.
these headphones sound OK - but are not very well built. The simply don't hold up very well. For the price I'm not sure what i expected - but these should go for $10 or $15 / not more...
I always have a problem with me ears hurting when using headphones.These are really comfortable for such a cheap price.
After using a sennheiser and bose, I bought this but i dont really recomend this headphones poor quality made and the sound its not perfect its good but no perfect
And from an aesthetic point of view, the red looks pretty sweet. I've owned other cheap Sony headphones in the past, and let me say... these are a HUGE improvement on previous designs. If you're looking for something that will hold up to the daily grind, look and sound great and won't break the bank, get these ASAP!
I'm no pro at this but I know when something sounds good. After having earbuds and headphones from all sorts of manufacturers over the years, I decided to try these Sony MDRZX300s and am pretty happy with my purchase. I have had them for less than a day but am already impressed by their performance. I am using these on a Lenovo netbook and they are plenty loud with nice low tones and crisp highs. I am mainly a smooth jazz sort of guy and these headphones are great for such listening.
this was a great purchase the sound is fantastic nice and crisp i would put these headphones up agaist any of 200-300 pairs on the market you cnat go wrong with these especially at the price
I listen to music on other devices with ear buds, which, in my opinion, if you can find a good pair that don't hurt your ears, are better than headphones. Not being a hard-core gamer, I'm not as picky as some might be about the sound in the game, but being a musician I do KNOW a little about sound quality.These headphones are not going to give you the rich, full sound that a more expensive set would.
I just received these headphones today. I'll say the headphones are plenty comfortable,well build and sturdy "looking". However if you are an Audiophile like me, you probably won't be 100% satisfied because these obsviously don't perform like a more expensive pair would. However these are of excellent quality for the price and I'm sure anyone will be able to notice a big difference between these and the 100's.
Answer: I think they would hold up pretty well. They're plastic, but sturdy and flexible at certain places. Just make sure no one twists the earpiece too far or accidentally sits on them.