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According to Fitbit my cardio score increased to 53-57 today. Pretty happy about that. It is claimed that this score is one's VO2max.
Swimming 2000yds per week this season has been more helpful than I expected.
My overnight resting heart rate last night got down to 48, a new low for me. Low RHR = good. My brother the marathon runner, 2 years younger than me, has a RHR in the low 40s, similar to my son.
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