There's a growing body of evidence that consistent self-monitoring, where you pick one metric and track it for 90 days, can meaningfully change health outcomes. Blood glucose. Resting heart rate. Sleep duration. VO2 max. These numbers, tracked over time, give clinicians something they rarely have: a baseline.

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Health trackers from brands like Garmin, Oura, and WHOOP don't just collect data, they establish your baseline. And a baseline changes everything. It's the difference between a practitioner guessing and a practitioner knowing.