Health Technology
Clear, detailed guides to the technologies shaping human performance and longevity.
Explore sleep, recovery, thermal therapies, fitness tools, and longevity science — written for people who want evidence, not hype.
Keersa AI
Get guidance grounded in Keersa guides and device reviews. Not medical advice — read our disclaimer.
Core pillars of health technology
Each category collects deep-dive articles on the devices, protocols, and research that matter.
Sleep
Technologies and protocols that improve sleep quality, recovery, and circadian health.
10 Detailed Guides
Fitness & Mobility
Tools and methods for strength, endurance, movement quality, and athletic performance.
11 Detailed Guides
Heat & Cold
Sauna, cold plunge, and thermal contrast therapies for resilience and metabolic health.
11 Detailed Guides
Recovery
Evidence-based recovery technologies including red light therapy, compression, and more.
11 Detailed Guides
Longevity
Interventions and biomarkers focused on healthspan, aging biology, and long-term vitality.
11 Detailed Guides
Guides to explore
The Recovery Protocol: What Actually Improves Recovery
An authoritative overview of recovery practice — sleep and easy movement first, then mechanical tools, compression, light, specialty modalities, and a clear map to every Recovery deep dive.
Read guide LongevityVO2 Max as a Longevity Biomarker
A deep dive into VO2 max as a healthspan biomarker — what the mortality evidence shows, how lab testing differs from watch estimates, and eleven measurement paths from metabolic carts to Garmin, Apple Watch, Polar, and free field protocols.
Read guide Fitness & MobilityGPS and Power Meters for Endurance
A detailed 2026 guide to GPS watches, bike computers, cycling power meters, and running power footpods — what actually improves pacing decisions outdoors.
Read guide LongevityRapamycin and Longevity Pharmacology
A clear-eyed deep dive into rapamycin (sirolimus) for longevity — how mTOR inhibition works, what mouse and human data actually show, risk framing, and why this remains a clinician-supervised conversation rather than a shopping list.
Read guide LongevityDEXA, Visceral Fat, and Body Composition
A deep dive into DEXA body composition for longevity — what the scan measures, why visceral fat matters more than the bathroom scale, how to read a report, and how often retesting is worth the radiation and cost.
Read guide Heat & ColdContrast Therapy Protocols
A detailed 2026 guide to contrast therapy protocols — heat-to-cold sequencing, classic contrast water ratios, sauna-and-plunge rounds, when to finish cold, and how to avoid stacking recovery theater on top of bad timing.
Read guide