Glasses, helmets, what have you—the next wave of wearable devices are targeting the brain. Whether you find it tempting or terrifying, the real question: Is this technology even real?

The Google Fit app, which helps you monitor your fitness goals, is available for download on both Android and iOS devices.

A compact, effective kettlebell workout for building muscle and stamina. No fancy gym gear — just you, one kettlebell, and ...