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Heart rate has been perfect for me, and has been logging since april 24th. Range is 41-193bpm, which is about right considering I surf for at least 2 hours a day on average and my resting heart rate is usually around 40-50bpm.


I should preface that statement by saying that I use the sport band, and I keep it quite snug on my wrist. I've seen a lot of women post photos of them wearing the watch and they tend to be... loose.
been surfing with the watch on?
 
Do you ride?

If you go for a ride and use the watch's workout app. Take an occasional glance at your heart rate. For me it fluctuates out of acceptable boundaries despite the strap fitting correctly.
 
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