Answer:
-changing to a treadmill that has handle sensors
Step-by-step explanation:
During running or any other sport that requires body exertion, it is natural for the heart rate to increase considerably, the heart under normal conditions of a healthy person can vary between 60 and 100 bpm (beats per minute). In this case, monitoring the heartbeat may be interesting not only for health but also to evaluate the practitioner's performance.
This monitoring is only possible through a device and although there are watches, bracelets, apps and other devices, among the options given in the question, one that would allow an individual to monitor their heart rate during running would be running on a treadmill that has handle sensors.