Testing the heart rate on the treadmill is actually not very accurate. After all, measuring heart rate is also a complicated process, and it is difficult to measure people's heart rate. You must be close to your body to test your heart rate.

The treadmill is basically not close to the body, so this test is not very accurate.

If you want to measure your heart rate, you can usually use your mobile phone's watch or bracelet. These are closer, that is, your pulse, and it is easier to measure your heart rate.