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A friend of mine and I have been bouncing this idea around about trying to see if we can build a pair of smart dumbbells. The idea is: Strava for Weight Lifting. Anyway, I happened to stumble upon this cool blog post about such a dumbbell built a hackathon in 24 hours, and wanted to bookmark it here for future reference => Arduino Integrated Dumbbell — The dumbbell that’s not dumb! Rep counting has never been easier!