It’s a bizarre sight: With a short burst of light, a sponge-shaped robot scoots across a tiled surface. Flipped on its back, it repeatedly twitches as if doing sit-ups. By tinkering with the light’s ...

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About a year ago, a fitness trend made waves on social media, and currently, Quadrobics is being hotly debated. It involves moving on all fours and mimicking animal movements. But can this really ...