Which device helps specify exercise intensity by monitoring heart rate in PE?

• A. Pedometer
• B. Heart rate monitor
• C. GPS watch
• D. Accelerometer

Answer: (B)

Monitoring how hard you’re working during exercise comes down to tracking the body's cardiovascular response. A heart rate monitor provides a live readout of beats per minute, letting you target and maintain specific intensity zones (for example, moderate or vigorous effort) based on your goals and fitness level. This direct measure of exertion is what makes it the best tool for specifying intensity.

Pedometers only count steps, so they don’t reflect how hard the heart is pumping. GPS watches track location, distance, and speed and may estimate effort indirectly, but they don’t measure heart rate unless paired with a heart-rate sensor. Accelerometers gauge movement and intensity of motion, not cardiovascular effort.