Everyone's checking their "real age." Your joints have one too.

Preview text: VO2 max, biological age, fitness age... there's one number nobody's testing, and it's the…

Monday, Jun 15, 2026 at 5:07 AM EasternKlaviyo

BioTRUSTEveryone's checking their "real age." Your joints have one too.

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Subject: Everyone's checking their "real age." Your joints have one too.
Preview text: VO2 max, biological age, fitness age... there's one number nobody's testing, and it's the…
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Sent: Mon Jun 15, 2026, 5:07 AM ET
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