Determine the front of the chest strap, usually a hard plastic, versus the back of the strap, usually made of an elastic material.
Slightly dampen the sensors on the back of the front of the chest strap by wiping it with a damp cloth. This will allow a stronger connection for the heart rate reading.
Remove your shirt and align the front and middle of the chest strap directly in the middle of your chest just under the breast plate.
Ensure that the hard plastic portion of the plate is resting directly against the skin.
Wrap the back of the strap, or the elastic portion, around your back and secure it on the other side or wherever the clasp or buckle may reside. It should be like wearing a belt around your lower chest.
Secure the strap and adjust it so that it fits snugly against the body and will stay in place during your exercise movement. Move around and jump up and down to ensure it doesn't shift.
Bring the wristwatch portion of the monitor in range with the front of the chest strap and allow it to register the heartbeat and set any other controls according to the instructions of your specific model.
Place the watch on either wrist so that it is in a comfortable position for you. Begin your workout and track your heart rate.