A retired doctor named Turner Osler has designed a chair that requires constant muscle engagement, much like an inflatable ball chair, but the plans are free and downloadable (and modifiable.) You can make it with a CNC router or just hand tools, and plywood. Supposedly they’re a big help for kids, who need to burn off energy so they can concentrate. You do need a lacrossse ball though.
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Nifty I might have to make one of those. what is and where do I get a lacrosse ball? (minor joke, down here nobody would know what that was)
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Champion Sports Official Lacrosse Balls - Multiple Colors in Packs of 1, 2, 3, 6, and 12 https://www.amazon.com/dp/B079Q144Y8/