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HEALTH & LONGEVITY GLOSSARY

Evidence-based definitions for fitness metrics, biomarkers, and training concepts.

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Fitness Metrics

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A subjective scale used to rate how hard exercise feels, from very light to maximum effort.

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A sleep stage characterized by rapid eye movements, vivid dreaming, and muscle paralysis, critical for memory consolidation and emotional processing.

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The number of heartbeats per minute while at complete rest, typically measured upon waking.