I understand this has been discussed previously but most of the threads were older and more importantly, none had a solution. My VA3 is slow to register increased heart rate- often taking more than 10 minutes. But tonight, I found a textbook example of the problem I could demonstrate. I got onto my elliptical and went as fast as I could stand. After the first minute, I could feel my chest pounding. It wasn't until the 10 minute mark that the watched turned accurate. To be clear, I didn't do anything special or different, I just kept the same 100% effort for the 30 minute session- but enough talk. A picture is worth a thousand words.