How to measure healthspan at home: a yearly checklist
An at-home healthspan checklist: VO2max, resting heart rate, blood pressure, waist-to-height, grip, sit-to-stand, balance and sleep, tracked yearly.
#sleep
Light exposure for health: daylight, sleep and timing
How light exposure affects your circadian rhythm, sleep and alertness, how much daylight you need, whether blue light at night matters, and when to train.
VO2max and sleep: how fitness and sleep improve each other
Sleep loss hurts endurance and recovery, and regular exercise improves sleep quality. What the research shows in both directions, and a practical routine.
Resting heart rate, HRV and recovery: what your watch is telling you
How resting heart rate and HRV reflect recovery, illness, alcohol and training load — and how to use them without obsessing over the numbers.