Not very resilient. The plastic is very thick and doesn't stretch/spring like a yoga ball, which is what I expected. In addition, the paint looks very cheap and smudged in some places. The size is perfect for a 1-2 year old but I don't think he'll be able to jump around much. It's also a bit tricky to plug the inflation hole without losing a lot of air in the process. I'm not sure how this compares to other similar products I've seen, but I wouldn't buy this product again.
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