Body & Health
Live longer, feel better, what's actually solid
Novice
Subdomain
Sleep is when your body and brain actually repair. Chronic stress without recovery quietly damages metabolism, mood, and immune function.
Sleep architecture
The structured pattern of sleep stages, light, deep, and REM, that cycles roughly every 90 minutes through the night.
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Heart rate variability
The natural variation in time between consecutive heart beats, used as a window into autonomic nervous system balance and recovery.
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Sleep hygiene
A set of behavioural and environmental practices that improve sleep onset, depth, and continuity by aligning with circadian and homeostatic systems.
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Meditation evidence base
A set of mental training practices (focused attention, open monitoring, loving kindness) shown in randomised trials to improve attention, emotional regulation, and stress markers.
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VO₂max
Max rate of oxygen use, a key measure of cardio fitness.
Sarcopenia
Age-related loss of muscle mass and strength.
Healthspan
Years lived in good health, not just total years alive.
Ultra-processed food
Food heavily transformed with industrial ingredients (Nova classification).
Chronic stress
Persistent activation of the stress response, damages multiple systems.
Relative risk
Risk in one group vs another, sounds bigger than absolute risk.
Absolute risk
Actual probability of an event in a population.
Meta-analysis
Statistical combination of many studies, usually more reliable than any one.
HRV
Heart rate variability, beat to beat variation, a proxy for recovery and stress.
NEAT
Non exercise activity thermogenesis, calories burned through daily movement outside workouts.
Zone 2
Steady aerobic effort where you can still talk, builds mitochondrial fitness.