Blog
Training readiness vs HRV trend: which should guide workouts?
Training readiness vs HRV trend explained: when to trust a recovery score, when to check your baseline, and how to adjust workouts safely without overreacting.
Sleep stages vs sleep score: which wearable metric is more useful?
Compare sleep stages and sleep score for wearable users, including accuracy limits, behavior decisions, recovery context, and what to track instead.
Sleep in perimenopause: why it changes before menopause
Sleep in perimenopause explained: why nights change before menopause, what recovery metrics reveal, and when symptoms deserve medical support without guessing.
Sleep apnea in men: the silent driver of accelerated cardiovascular aging
Untreated sleep apnea adds ~6 years of biological aging in men. Why OSA hits male cardiovascular health hardest, plus what tracking can reveal.
Anxiety and accelerated aging: chronic worry and shorter telomeres
Studies link chronic anxiety with shorter telomeres and stress biology. Learn what the evidence shows, how to track signals, and ways to support recovery.
Recovery and biological age: why insufficient recovery can erase your fitness gains
Recovery debt blunts training adaptation and accelerates biological aging. Learn how to read recovery signals before stress erases your fitness gains.
Red light therapy for skin aging, recovery, and sleep: what the evidence shows
Red light therapy promises smoother skin, faster recovery, and better sleep. Here's what the evidence actually says — and what marketing exaggerates.
Sleep stages by age: How REM, deep, and light sleep change as you get older
Discover how sleep architecture shifts with age, what percentage of deep and REM sleep is normal, and science-backed strategies to protect your sleep quality.
Normal sleep duration by age: how much sleep you actually need (chart)
Complete chart of recommended sleep hours by age from newborn to 65+. Learn how sleep needs change, what happens when you get too little, and how to optimize.