Is “Biological Age” Useful According to Science? Systematic 2026 Outlook & 2025 Year Review (Fit For Science Episode 6)

Rob and Stephan analyze their 2025 health data, discuss the validity of "biological age" metrics, and set systems-based goals for the coming year.

📝Summary
In this episode, biological data scientists Rob and Stephan explore how to use wearable data to review the past year and plan for a better future. They critique the "year in review" features of popular apps, debating whether these metrics provide actionable insights or merely gamified motivation. The discussion moves into the science of cardiovascular age and pulse wave velocity, highlighting how short-term exercise interventions might alter arterial stiffness markers. Reflecting on personal growth, Rob shares his transition from manual to more automated tracking for perceived happiness, while Stephan outlines a systematic "Past Year Review" framework to replace traditional New Year’s resolutions. The episode concludes with a look at 2026 technological trends, including the potential for better batteries, screenless GPS wearables, and new FDA regulatory pathways that could integrate consumer health tech into clinical practice.

⏳Chapters
00:00:00 Year in Review: Discussing App Recaps and Comparisons
00:07:47 Feedback Loops: How to Use Data Trends for Behavioral Change
00:24:48 Biological Age: Decoupling Marketing from Physiological Truth
00:35:15 Cardiovascular Age: Pulse Wave Velocity and Arterial Adaptation
00:48:57 The Importance of Controls: Lessons from a Cold Exposure Study
01:03:17 Nerve Health: Tracking Impact and Recovery via Smart Scales
01:06:54 Quitter’s Day vs. Systems: Why New Year’s Resolutions Fail
01:08:15 The Past Year Review: A Data-Driven Framework for Lifestyle Design
01:12:26 2026 Goals: Marathons, Biking Rivalries, and Life Balance
01:21:10 Professional Focus: Cutting Out Distractions to Finish Projects
01:23:54 One-Bag Travel: Reflections on Minimalist Gear and Efficiency
01:27:03 Future Wearables: GPS, Battery Tech, and FDA Regulation

📚Resources
Oura 2025 year in review (ouraring.com/blog/2025-year-in-review/⁠ )
Whoop 2025 year in review (whoop.com/at/en/thelocker/whoop-year-in-review… )
"Comparison is the death of joy." - Mark Twain
Arthur C. Brooks Personality Types Quiz (arthurbrooks.com/quiz/panas⁠ )
Doctor Mike confronting Dr. Amen (youtube.com/watch?v=J-SHgZ1XPXs⁠ )
“Imperfect data can still have value” - Joe Barnard (from bps.space)
Heroic dose (en.wiktionary.org/wiki/heroic_dose⁠ )
"Long-term consistency trumps short-term intensity." - Bruce Lee
Whoop biological age (support.whoop.com/s/article/Healthspan-WHOOP-A… )
VO2max and longevity (peterattiamd.com/how-does-vo2-max-correlate-wi… )
Lancet Public Health: “7,000 steps/day linked to clinically meaningful health improvements.”: thelancet.com/journals/lanpub/article/PIIS2468…)00164-1/
Pulse Wave Velocity (PWV): en.wikipedia.org/wiki/Pulse_wave_velocity
PWV relationship to blood pressure: pnas.org/doi/10.1073/pnas.1814392115
Arteries: my.clevelandclinic.org/health/body/22896-arter…
Muscle memory in strength training (en.wikipedia.org/wiki/Muscle_memory_(strength_…)⁠ )
Endurance memory exists and is driven by persistent structural adaptations (capillary density and cardiac remodeling) and epigenetic priming.
“Quitter's day” is the second Friday in January.
Stephan's Past Year Review instructions (stephanreichl.notion.site/Past-Year-Review-PYR… )
Stephan's backpack and packing list (stephanreichl.notion.site/Packing-Lists-448433… )
The Greek philosopher Plato proposed the Theory of Forms, asserting that the physical world consists of imperfect copies of eternal, perfect, and abstract "master" templates existing in a higher realm of reality.
Oura executives (CEO (wsj.com/opinion/with-less-regulation-your-oura… ) and CMO (medtechdive.com/news/oura-cmo-wearables-fda-pa… )) on new regulatory pathway for wearables

🎙️About
Fit For Science is a deep-dive podcast hosted by two biological data scientists, Rob and Stephan, exploring the intersection of research, health tech, and data-driven lifestyle design. The hosts provide evidence-based systems, layered with practical "N=2" personal experimentation, to cut through the noise in the health and fitness industry.
Learn more (creators.spotify.com/pod/show/fitforscience⁠ )
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⚠️Disclaimer: This podcast represents our own opinions and is for informational purposes only. It does not constitute medical or financial advice or a professional relationship.