TIP: Warm up before and cool down after exercices. These should be done with low intensity (zone 1 or below).
Read more about using HR zones in Section 9.1 Heart rate zones on page 17.
Suunto M1/M2 uses coded transmission to prevent reading disturbances. However, exercising near overhead power lines, magnetic or electronic devices may cause interference with the HR signal.
If you lose the HR signal, try the following:
Check that you are wearing the HR belt correctly.
Check that the electrode areas of the HR belt are moist.
Move away from any potential sources of interference.
Replace the battery of the HR belt and/or the device, if problems persist.