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My physio has me do shallow knee bends whilst standing on this jiggly machine for 5 minutes before she starts treating my torn calf muscle. She says it was developed by the Russians for astronaut training, but that it is often used for weight loss in people with restricted mobility, including the very obese. The idea is that you do exercises like squats or push ups on it and it engages more muscles than doing those exercises without being jiggled, so one gets more benefit for one's exercise buck. I looked dubious but she reckons it works. You do have to exercise, not just sit on it. It is really really jiggly.

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