Innovation of the week: The Naked 3D Fitness Tracker

"Have you ever tried to see what your butt looks like to other people?" asked Susan Rinkunas at New York magazine. Well, it's about to get a lot easier, thanks to a new "smart mirror" that will show you your body in extensive, perhaps excruciating, detail. The Naked 3D Fitness Tracker pairs a rotating scale with a smart mirror to scan your body in 3-D and generate a "claylike rendering of you in your undies" in a companion app.

The readout then shows where your body is gaining muscle or fat, as well as your measurements. You can also view a time-lapse showing your improvement — or lack thereof. Hard-core fitness fanatics will likely appreciate the tracker's promised precision, which the makers say will be more accurate than home body-fat scales, but it "could be extra defeating if all those workouts aren't doing a thing."

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