Health and Fitness

Yoga, Ayurveda, strength training, sleep science and nutrition — a mix of Indian tradition (Ayush, Fit India) and global exercise/nutrition science.

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The Eight Limbs of Yoga (Ashtanga) — Patanjali's Yoga Sutras

The classical eight-stage framework for yoga practice laid out in Patanjali's Yoga Sutras, of which physical postures are only one part. - **Yama** — ethical restraints toward others (non-violence, truthfulness, non-stealing, and so on) - **Niyama** — personal observances (self-discipline, contentment, self-study) - **Asana** — physical postures — what most modern practice focuses on almost exclusively - **Pranayama** — breath control - **Pratyahara, Dharana, Dhyana, Samadhi** — withdrawal of the senses, concentration, meditation, and absorption — the progressively deeper stages toward stillness

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BMI and Its Limitations as a Health Metric

Why Body Mass Index is a useful screening tool but not a diagnosis. - Overestimates body fat in muscular or athletic people, and underestimates it in those with low muscle mass - Doesn't directly measure body fat percentage or where fat is distributed on the body - Cut-off thresholds may need adjustment across different populations, ethnicities and age groups - Best used as a rough screening tool, not a standalone diagnostic measure *Source: Cleveland Clinic*

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Progressive Overload Principle

Gradually increasing the demands placed on a muscle over time so it keeps adapting — the core driver of strength and hypertrophy gains. - Without it, training plateaus into maintenance rather than continued progress - Common methods: add weight once 5+ extra reps feel doable, add reps or sets, reduce rest time, slow the tempo - Applies beyond weightlifting too — e.g. running: increase mileage, speed, incline or frequency over time *Source: Cleveland Clinic, Progressive Overload guide*

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Macronutrients — Protein, Carbs, Fats Basics

The three categories of nutrients the body needs in large amounts, each with a distinct role. - **Carbohydrates:** the body's primary fuel source; commonly recommended at ~45–65% of daily calories - **Protein:** roughly 0.8g per kg of bodyweight per day is the standard adult baseline (~10–15% of calories) - **Fat:** 9 calories per gram, versus 4 calories per gram for protein and carbohydrates - There's no single "magic ratio" — food quality matters more than hitting an exact macro split *Source: Harvard Health / Merck Manual*

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The Physiology of Sleep Cycles

How a night's sleep is actually structured, cycle by cycle. - Two phases: **NREM** (stages N1–N3) and **REM** sleep - A full cycle repeats roughly 4–6 times per night, averaging about 90 minutes each - N1 = lightest, falling asleep; N2 = deeper relaxation, heart rate and temperature drop; N3 = deep restorative sleep; REM = most dreaming, brain activity rises, body temporarily paralyzed - Regulated by the circadian rhythm via the brain's suprachiasmatic nucleus (SCN) *Source: Sleep Foundation / NIH NHLBI*

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Doshas in Ayurveda — Vata / Pitta / Kapha Basics

The three fundamental energies Ayurveda holds are present in everyone, in an individual proportion, with one usually dominant. - **Vata** (space + air) — governs movement: circulation, breathing, nerve conduction, thought - **Pitta** (fire + water) — governs metabolism and transformation - **Kapha** (water + earth) — governs body structure and stability - Ayurveda frames disease as arising from imbalance — excess or deficiency — among the three *Source: Ministry of Ayush*

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Nutrition Science Basics

**Curated links on nutrition science basics:** - [Harvard Health: Nutrition](https://www.health.harvard.edu/topics/nutrition) A hub of evidence-based nutrition articles. - [Merck Manual: Carbohydrates, Proteins, and Fats](https://www.merckmanuals.com/home/disorders-of-nutrition/overview-of-nutrition/carbohydrates-proteins-and-fats) Consumer-grade clinical reference on macronutrients. - [Dietary Guidelines for Indians 2024 (ICMR-National Institute of Nutrition, official)](https://www.nin.res.in/downloads/DietaryGuidelinesforNINwebsite.pdf) India's official government dietary guidance, updated 2024. - [National Institute of Nutrition, Hyderabad — Wikipedia](https://en.wikipedia.org/wiki/National_Institute_of_Nutrition,_Hyderabad) Background on the institution behind India's dietary science.

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Fit India — Official Portal

Government fitness movement launched 2019: protocols, certification, and activity tracking.

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NHS: Exercise (hub)

The UK's central exercise guidance and workout hub.

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Strength Training & Exercise Science

**Curated links on strength training & exercise science:** - [ACSM Resistance Training Guidelines (2026 update)](https://acsm.org/resistance-training-guidelines-update-2026/) First major update in 17 years from the American College of Sports Medicine, based on 137 systematic reviews. - [CDC: Adult Activity — An Overview](https://www.cdc.gov/physical-activity-basics/guidelines/adults.html) Official aerobic and strength activity recommendations for adults. - [CDC: Physical Activity Guidelines for Americans (2nd Edition)](https://www.cdc.gov/physical-activity/media/pdfs/Physical_Activity_Guidelines_2nd_edition.pdf) The full official US guideline document. - [NHS: Physical Activity Guidelines for Adults 19–64](https://www.nhs.uk/live-well/exercise/physical-activity-guidelines-for-adults-aged-19-to-64/) The UK's national health service's official exercise recommendations.

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Sleep & Recovery

**Curated links on sleep & recovery:** - [Sleep Foundation: Stages of Sleep](https://www.sleepfoundation.org/stages-of-sleep) A clear breakdown of the NREM/REM sleep-cycle stages. - [NIH NHLBI: How Sleep Works — Sleep Phases and Stages](https://www.nhlbi.nih.gov/health/sleep/stages-of-sleep) The US National Institutes of Health's official explainer. - [NCBI StatPearls: Physiology, Sleep Stages](https://www.ncbi.nlm.nih.gov/books/NBK526132/) Clinical-grade reference detail on sleep physiology.

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Yoga & Ayurveda Fundamentals

**Curated links on yoga & ayurveda fundamentals:** - [Ministry of Ayush — Official Portal](https://ayush.gov.in) India's government ministry for Ayurveda, Yoga, Naturopathy, Unani, Siddha and Homoeopathy — the authoritative national source. - [The Yoga Institute (Mumbai)](https://theyogainstitute.org) Founded 1918 — the world's oldest organized yoga center, AYUSH-certified. - [Bihar School of Yoga](https://www.biharyoga.net/) Founded 1963 in Munger, Bihar — globally influential residential yoga training institution.

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