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At an Orangetheory class on Capitol Hill, participants wear heart-rate monitors and keep track of how they are doing via big screens.
BENJAMIN BENSCHNEIDER / THE SEATTLE TIMES

At an Orangetheory class on Capitol Hill, participants wear heart-rate monitors and keep track of how they are doing via big screens.

Orangetheory offers interval training with heart monitors | Fit for Life

You wear a monitor and can look at a screen while running full-tilt on a treadmill to see if you’re in your fat-burning green zone, have pushed yourself into orange or are at your max in red.

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