THE CLAIMS

Fitness tracking devices are overwhelmingly popular. For instance, since its inception, the leading brand, Fitbit, has sold at least 30 million of them. The company promises on its website that the devices “track steps, distance, calories burned, floors climbed, active minutes & hourly activity.” Others, such as PulseOn, Apple Watch, Basis Peak, Samsung Gear S2 and Microsoft Band, promise the same.