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The market for smart bands is getting pretty crowded. It’s hard to beat the Fitbit Air on value or the Whoop on performance analytics, and anything in between struggles to make itself stand out. But the Speediance strap caught my eye for an unusual feature it includes: a sensor that claims to measure your core body temperature during workouts.

Does the Speediance Strap really measure core temperature?

The only other device I’ve seen make a similar claim is the Core 2 thermal sensor, which I wore for a summer’s heat training and found it valuable and useful (though not without a few caveats).…