I Reverse-Engineered My Apple Watch to See If My Rehab VO2 Max Was Real

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I am a data junkie. I track, measure, and optimize. So, when a severe ankle injury recently sidelined me, the hardest part wasn't the physical pain it was watching my hard earned fitness metrics plummet while I sat powerless on the sidelines.

For the last five weeks, I’ve been cleared to walk. My "North Star" for this comeback? VO2 Max. I’ve watched the numbers slowly climb back toward my peak, but it raised a nagging question: Can I trust the data? Since I can’t wear a clinical oxygen mask on my neighborhood rehab walks, I’m relying on my Apple Watch. I needed to know exactly how a wrist-worn sensor measures elite-level fitness when I’m barely breaking a sweat.

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