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When I got my Galaxy Watch 4 I had an Oppo Reno 4z. After my walks I consistently got 30 odd VO2 max. (Poor).
Then I started using the Watch with my new Samsung Galaxy A52s. Suddenly I'm consistently getting 43 (Excellent).
Needless to say unless there is an explanation...I don't know which is correct. Though I expect poor. Basically zero trust in the VO2 max results of my watch.