Whether you are talking about working out, manufacturing, or the environment, what goes around comes around. If you dont believe us, look no further than Natural Fitness Burst Resistant Exercise Balls. Perfect for taking crunches, bridges, and planks to the next level, by working this piece of equipment into your fitness regimen you can look forward to improved core strength and balance. To make sure our societys future is as bright as yours, we manufacture these products using a non-toxic/phthalate-free material that takes into account your health as well as the planets. By making these balls burst resistant up to 300 lbs., weve given you piece you mind so that you can employ this product in your most intense sweat sessions.