Stopwatch, calorie expenditure, pulse monitor.

秒表，卡路里消耗，心率监测功能。

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He likes to use a pulse monitor wristwatch, which has a cartoon face to tell the wearer when to put in more effort, depending on their optimal heart rate.

WSJ: Gadgetry on the Greens

Many were to do with health - from the pulse monitor you plug into your smartphone, to a fitness monitor, the Fitbug, which sets you exercise goals after monitoring your physical activity.

BBC: CES: The selling starts

Checking your heart rate, whether using a monitor or simply feeling your pulse immediately after a workout, can provide valuable information as to how hard you are working.

CNN: Is it possible to 'top out' on cardio strength?