When actively exercising manual measured heart rate between 135-140 forerunner measures 90-110 or less. How to correct
Which Forerunner do you have? There are a variety of fixes, depending on the model. Usually involving making sure you wear it correctly. Ultimately a chest strap will perform better in most cases.
The 35. The light sensor is clean and the strap was snug but not tight.
moved thread to Forerunner 30/35 forum.
