📓 Speaking of which:
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Functional Longevity Journal – FLX-101
Longevity is ultimately a question of time. Tools that help us understand our own timeline bring the science of long life into everyday life.
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Longevity AI – The Book of You, The Purist, May 2026🔗
Longevity AI Platform
5. 😄 Fun Longevity – Quote of the WeekA myokine meets myostatin in the bloodstream.
Myokine: "Where are you going in such a hurry?"
Myostatin: "I have to stop this muscle from getting any bigger."
Myokine: "Too late. He just did HIIT."
Myostatin: "…When will this person finally stop making my life so difficult?"
Myokine: "Hopefully never."
📖
Technical Glossary – New Terms in This Issue, Simply ExplainedApelin – a myokine released during exercise that supports muscle growth, fat metabolism, and heart function; without it, muscles can barely respond to strength training
Biological age – your body's actual level of aging at the cellular and organ level, independent of your date of birth; positively influenced by lifestyle
Biomarkers – measurable biological values (e.g., in blood) that provide insight into health, disease risk, or biological age
(covered in the previous issue—included here as a reminder)
Cognitive decline – the age-related reduction in memory, concentration, and processing speed; can be slowed through exercise, sleep, social engagement, and mindset work
Exerkines – an umbrella term for all signaling molecules the body releases during movement; includes myokines (from muscle), cardiokines (from the heart), and hepatokines (from the liver)
HIIT (High-Intensity Interval Training) – short, very intense exercise intervals alternating with recovery phases; currently the most effective format for older adults to reduce fat without losing muscle mass
Hypertrophy – the enlargement of muscle cells through training; occurs when protein synthesis exceeds protein breakdown
IGF-1 (Insulin-like Growth Factor 1) – a growth hormone-like signaling molecule that promotes muscle growth and is stimulated by exercise
Myostatin – the body's natural brake on muscle growth; the less active it is, the more muscle growth is possible; exercise lowers its levels
Resilience – the capacity to absorb stress and recover from it; considered a key protective factor for a long, healthy life—biologically and psychologically
Sweet spot – in exercise science, the range where benefit is greatest and risk is lowest; for longevity-focused strength training, Harvard puts it at 90–120 minutes per week
Trajectory – a progression curve; in medicine, how a health metric develops over time