These devices may offer a fresh outlook on fitness habits …, The 41-year-old businessman sleeps with a gadget on his forehead …, And finally, a test to measure his physical reaction time., Bob is part of a growing international community of “self-quantifiers” …, Just that awareness that you’re being watched, and your activity levels being monitored, leads you to get more activity., David adds that the ability of devices to share vital data with other users adds a competitive element to using them.

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