
Sleep, recovery, and performance: the metrics that matter
HRV, deep sleep, resting heart rate — what to act on, what to ignore.
Calm is a mental wellness app focused on meditation, sleep, relaxation, breathwork, and stress-management habits.
People seeking sleep support, stress management, meditation, relaxation, and simple daily mental wellness routines.
These are editorial signals, not endorsements. Always pair with qualified medical guidance.
A short due-diligence list to apply before paying, booking, subscribing, or building a routine around any longevity tool, test, or program.
What exactly will this measure, track, or improve — and over what time horizon?
Is there medical or clinician oversight, and how qualified are the people behind it?
How should I interpret the data, and what does a meaningful change actually look like?
What will I do differently with the results? If the answer is unclear, the signal isn't useful yet.
Is the claim evidence-led or marketing-led? Where is the underlying research?
What is the true cost after the first purchase, test, or subscription — including renewals?
Does this replace medical advice? It should not. Where does professional care still belong?
How does this compare to simpler, lower-cost, or higher-evidence alternatives?
Buck Institute is a biomedical research institution focused on the biology of aging and age-related disease.
Stanford Center on Longevity advances research, education, and public engagement around longer, healthier, more purposeful lives.
USC Longevity Institute focuses on translational research on aging, longevity, nutrition, fasting, and age-related disease.
BrainHQ offers online brain training exercises for memory, attention, processing speed, people skills, decision-making, and navigation.
Headspace is a mental wellness app offering meditation, sleep, mindfulness, stress, coaching, and mental health tools.
Mental wellness apps can support stress and sleep routines but should not replace care for significant anxiety, depression, insomnia, or other health concerns.

HRV, deep sleep, resting heart rate — what to act on, what to ignore.