# revns dictionary

Plain definitions of training, nutrition, sleep, gut-health and AI terms.

- [Active recovery](https://revns.com/dictionary/active-recovery.md): Active recovery is light movement, such as walking, easy cycling or mobility work, on rest days or after hard sessions.
- [Bloating](https://revns.com/dictionary/bloating.md): Bloating is a feeling of fullness or swelling in the abdomen, often with wind.
- [BMR](https://revns.com/dictionary/bmr.md): BMR (basal metabolic rate) is the energy your body uses at complete rest to keep you alive.
- [Bone mineral density](https://revns.com/dictionary/bone-mineral-density.md): Bone mineral density (BMD) is the amount of mineral in a given area of bone, measured with a DXA scan.
- [Bowel movement](https://revns.com/dictionary/bowel-movement.md): A bowel movement is passing stool. Anywhere from about three a day to three a week is common.
- [Bristol stool scale](https://revns.com/dictionary/bristol-stool-scale.md): The Bristol stool scale is a seven-type chart of stool form, from separate hard lumps (type 1) to entirely liquid (type 7).
- [Cadence](https://revns.com/dictionary/cadence.md): Cadence is how often a session is expected, such as a run every three days or a swim every seven.
- [Calisthenics](https://revns.com/dictionary/calisthenics.md): Calisthenics is strength training with your own bodyweight: push-ups, pull-ups, squats, dips and planks.
- [Calorie deficit](https://revns.com/dictionary/calorie-deficit.md): A calorie deficit means eating less energy than you use, which leads to weight loss over time.
- [Circadian rhythm](https://revns.com/dictionary/circadian-rhythm.md): The circadian rhythm is the body's roughly 24-hour internal clock that times sleep, hormones and alertness.
- [Compound exercise](https://revns.com/dictionary/compound-exercise.md): A compound exercise works several joints and muscle groups at once, such as a squat, deadlift, push-up or row.
- [Constipation](https://revns.com/dictionary/constipation.md): Constipation means passing stool less often than usual or with difficulty, often hard and lumpy (Bristol types 1–2).
- [Day score](https://revns.com/dictionary/day-score.md): The day score is a 0–100 summary of how a day went against your own targets across six pillars.
- [Deload](https://revns.com/dictionary/deload.md): A deload is a planned lighter week or few days, with less volume or intensity, to let fatigue fall.
- [DOMS](https://revns.com/dictionary/doms.md): DOMS (delayed-onset muscle soreness) is muscle soreness that peaks one to three days after unfamiliar or hard exercise.
- [Eggetarian](https://revns.com/dictionary/eggetarian.md): An eggetarian diet is vegetarian with eggs: no meat or fish, but eggs and usually dairy.
- [Electrolytes](https://revns.com/dictionary/electrolytes.md): Electrolytes are minerals such as sodium, potassium and magnesium that carry charge and help regulate fluid and muscle function.
- [Fibre](https://revns.com/dictionary/fibre.md): Fibre is the part of plant foods the body cannot fully digest, which supports digestion and gut bacteria.
- [Gut microbiome](https://revns.com/dictionary/gut-microbiome.md): The gut microbiome is the community of bacteria and other microbes living in the digestive tract.
- [Heart rate reserve](https://revns.com/dictionary/heart-rate-reserve.md): Heart rate reserve is the difference between your maximum and resting heart rate.
- [HRV](https://revns.com/dictionary/hrv.md): HRV (heart rate variability) is the variation in time between heartbeats, a marker of how the nervous system is balancing stress and recovery.
- [Hydration](https://revns.com/dictionary/hydration.md): Hydration is having enough body water for normal function, maintained by drinks and the water in food.
- [Hypertrophy](https://revns.com/dictionary/hypertrophy.md): Hypertrophy is the growth of muscle fibres in size, usually from resistance training and enough protein.
- [Hyrox](https://revns.com/dictionary/hyrox.md): Hyrox is a standardised fitness race combining eight 1 km runs with eight functional workout stations.
- [Jain diet](https://revns.com/dictionary/jain-diet.md): A Jain diet is a strict vegetarian diet that also avoids eggs and, for many, root vegetables such as onion, garlic and potato.
- [Macronutrients](https://revns.com/dictionary/macronutrients.md): Macronutrients are the nutrients eaten in large amounts that provide energy: protein, carbohydrate and fat.
- [MCP](https://revns.com/dictionary/mcp.md): MCP (Model Context Protocol) is an open standard for connecting AI assistants to outside tools and data.
- [MCP server](https://revns.com/dictionary/mcp-server.md): An MCP server is a service that exposes tools and data to AI assistants through the Model Context Protocol.
- [Mobility](https://revns.com/dictionary/mobility.md): Mobility is the ability to move a joint actively through its full range of motion with control.
- [OAuth](https://revns.com/dictionary/oauth.md): OAuth is a standard for granting an app limited access to your account without sharing your password.
- [One-rep max](https://revns.com/dictionary/one-rep-max.md): One-rep max (1RM) is the heaviest load you can lift once with good form for a given exercise.
- [Perimenopause](https://revns.com/dictionary/perimenopause.md): Perimenopause is the transition before menopause, when periods change and symptoms such as hot flushes can start.
- [Pillar](https://revns.com/dictionary/pillar.md): A pillar is one of six areas the day score is built from: train, move, sleep, recover, fuel and mind.
- [Polarised training](https://revns.com/dictionary/polarised-training.md): Polarised training is an endurance approach with most sessions easy and a smaller share hard, and little in between.
- [Progressive overload](https://revns.com/dictionary/progressive-overload.md): Progressive overload is gradually increasing the demand of training (reps, load, sets or difficulty) so the body keeps adapting.
- [Prostate-specific antigen](https://revns.com/dictionary/prostate-specific-antigen.md): Prostate-specific antigen (PSA) is a protein made by the prostate that can be measured in a blood test.
- [Protein](https://revns.com/dictionary/protein.md): Protein is the macronutrient that supplies amino acids for building and repairing muscle and other tissues.
- [Recovery](https://revns.com/dictionary/recovery.md): Recovery is the process of returning to readiness after training, driven mostly by sleep, food and lighter days.
- [Resting heart rate](https://revns.com/dictionary/resting-heart-rate.md): Resting heart rate is your heart rate at complete rest, usually measured on waking.
- [RMSSD](https://revns.com/dictionary/rmssd.md): RMSSD is the most common way to put heart rate variability into one number: the typical size of the change between one heartbeat interval and the next, in milliseconds.
- [Rotation group](https://revns.com/dictionary/rotation-group.md): A rotation group is a set of sessions that take turns, such as a strength split of chest, back, legs and core.
- [RPE](https://revns.com/dictionary/rpe.md): RPE (rating of perceived exertion) is a 1–10 scale of how hard a set or session feels.
- [Sleep cycle](https://revns.com/dictionary/sleep-cycle.md): A sleep cycle is one pass through the stages of sleep, light, deep and REM, lasting roughly 90 minutes on average.
- [Sleep debt](https://revns.com/dictionary/sleep-debt.md): Sleep debt is the shortfall that builds up when you sleep less than you need over several nights.
- [Surya namaskar](https://revns.com/dictionary/surya-namaskar.md): Surya namaskar (sun salutation) is a flowing sequence of yoga postures linked with the breath.
- [TDEE](https://revns.com/dictionary/tdee.md): TDEE (total daily energy expenditure) is the total energy you use in a day: resting metabolism plus activity and digesting food.
- [VO2 max](https://revns.com/dictionary/vo2-max.md): VO2 max is the maximum rate at which your body can use oxygen during hard exercise, in ml per kg per minute.
- [Zone 2](https://revns.com/dictionary/zone-2.md): Zone 2 is steady, conversational aerobic exercise at roughly 60–70% of maximum heart rate.

---

Canonical: https://revns.com/dictionary
Index of everything: https://revns.com/llms.txt
revns gives training guidance, not medical advice.