I have been using the Oura Ring for about nine months now, and I highly recommend it. It has been amazingly accurate and has provided great insights regarding my sleep quality and readiness for the next day's workout(s).
I found that being able to add activities and intensity has really helped with the accuracy of the day's overall activities.
The HRV data has been one of the best metrics in my mind for readiness, but all the data has been both consistent and useful.
I did have an issue with battery life at one point. I contacted Oura, they looked at my data (that is synced with the Oura Cloud), and they determined that my power consumption was high and promptly sent out a new ring.
I use the ring during cross-training, running, weightlifting (even deadlifting), yoga, rowing, and cycling. I haven't had any issues with cracking, durability or discomfort.
I have already pre-ordered the new style ring and can't wait to get it. It has been by far the best fitness/ self-quantification tool I have tried. And I have tried many of them.
Bottom Line: Yes, I would recommend this to a friend
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