Smartwatches and other wearable devices can feel almost magical. Strap on a Fitbit, Apple Watch or Samsung Gear and you’re suddenly presented with a stream of data generated by – and about – your body: step counts, heart rate, blood oxygen level, calories burned and more.
Wearables offer tools that help people monitor and understand their bodies and, so the promise goes, improve their lives. Apple CEO Tim Cook has even said the technology company aspires to save your life.
