Smartwatch heart rate accuracy decreases as exercise intensity increases, making chest strap heart rate monitors a more accurate investment for heart rate training.

“I think the accuracy of the smart watches is is obviously there they've been you know validated against EKG and things like that but as LaVine mentioned and as others have kind of drawn caution they tend to get less accurate as the intensity of exercise increases they're not perfect because you know it's getting your heart rate reading from a sensor on your wrist um versus your chest so I would encourage everybody to invest in a heart rate chest you know a chest strap monitor”