Many think of the wrist as the natural place to put a wearable sensor. The smartwatch trend attests to this. But Lumafit has other ideas. "Wrist-worn sensors are great for step counting but give little insight into your workouts where you actually break a sweat," the company said. A better location, according to Lumafit, is the head.
Its ear-worn sensor tracks head motions. It identifies the unique 3-D signature of different exercises, such as situps, pushups and lunges, in real time. It can also tell what cardio machine the wearer is using. An earbud heart monitor records the intensity of the workout.