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
Circadian Lighting for the Home
A detailed 2026 guide to circadian-friendly home lighting — Philips Hue, LIFX, Nanoleaf, Govee, wake-up lights, HappyLights, and specialty bulbs — with lux timing, costs, and setup advice.
Read guide RecoveryRed Light Therapy: Mechanisms and Use Cases
Wavelengths, irradiance, fluence, and the gap between cosmetic masks and clinically meaningful photobiomodulation — plus eleven panels, masks, belts, and mats that map each use case.
Read guide Fitness & MobilitySmart Resistance Equipment
A detailed 2026 guide to smart resistance equipment — wall-mounted digital weights, freestanding motorized gyms, AI free-weight coaches, and connected adjustable dumbbells — with membership math and evidence caveats.
Read guide Fitness & MobilityThe Performance Protocol: What Actually Improves Training
An authoritative 2026 overview of how to improve training — progressive stimulus, readiness signals, measurement tools, and specialty gear — plus a practical order of operations before you buy fitness tech.
Read guide SleepWearable Sleep Trackers Compared
A detailed 2026 comparison of the major wearable sleep trackers — including Oura, WHOOP, Apple Watch, Fitbit, Garmin, Samsung Galaxy Ring, and more — with deep device reviews, cost-of-ownership estimates, and an interactive feature table.
Read guide Heat & ColdCryotherapy Chambers vs Cold Water
A detailed 2026 comparison of whole-body cryotherapy chambers versus cold-water immersion — air vs water conductivity, Amazon-buyable options, studio membership math, and what the evidence actually supports.
Read guide