How to Turn Your Body Into a Computer (Sort Of)

Illustration by Peter Crowther; Getty (runner)
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Ready to Wear

A wave of companies, many of them start-ups, is creating wearable electronic tracking devices for nearly every part of the human body, from brainwave-monitoring headbands to smart socks. Retail revenue from wearable technology is predicted to reach $19 billion by 2018, according to a new study from Juniper Research. Here’s a look at the products already on the market as well as a few of the items launching in the next year.