Correctly wearing the watch on your wrist is essential obtain more accurate heart rate measurements. In particular, before running or engaging in any other exercise, follow the steps below to ensure that the watch will not shake or slide as you exercise.

1.With the watch fastened loosely on your wrist, place at least one finger to the right of the pressure sensor on the right side of the watch* (Figure ).

* If you wear the watch on your right wrist, place your finger(s) to the left of the (C) button (left side of the watch).

• If the watch covers the protruding bone of your wrist (your ulna, which is circled in the nearby figure), keep adding fingers until it doesn’t anymore.

• The location and shape of this bone differ from person to person.

2.Position the watch so there is at least one finger width between it and your wrist joint when you bend your hand back (Figure ).

3.After you determine the best wrist position for the watch, tighten the band securely enough to keep the watch from sliding on your wrist.