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Hardgainer Glossary
The hardgainer glossary explains every term you need for building muscle as a hard gainer: defined in a few lines, backed by studies and assigned to one of the six pillars of the Knowledge Base. So you see not just what a term means, but where it sits in your system.
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0-9
1 term1RM (One-Rep Max)
The maximum weight for exactly one repetition, your absolute strength benchmark.
A
1 termATP (Adenosine Triphosphate)
The universal energy carrier of your cells, no ATP, no muscle contraction.
B
1 termBMR (Basal Metabolic Rate)
The energy your body burns at complete rest, the foundation of your TDEE.
C
5 termsCaffeine
Adenosine antagonist with proven performance benefits, dose and timing are key.
Circadian Rhythm
Your internal clock governs sleep, hormones and training performance on a 24-hour cycle.
Clean Bulk
Controlled caloric surplus with high nutrient density, quality over quantity.
Cortisol
The stress hormone affects energy balance, sleep and recovery, the dose makes the poison.
Creatine
The most researched supplement, boosts ATP resynthesis, strength and cell hydration.
D
4 termsDeload
Planned recovery week for fatigue reduction, strategic, not lazy.
DIAAS and PDCAAS
Protein quality scoring systems based on amino acid availability and digestibility.
Dirty Bulk
Uncontrolled caloric surplus regardless of nutrient quality, high fat gain risk.
DOMS (Delayed Onset Muscle Soreness)
Delayed muscle pain after eccentric loading, not a marker of workout quality.
E
3 termsEAT (Exercise Activity Thermogenesis)
Energy expenditure from intentional training, distinct from NEAT and TEF.
Ectomorph
Body type with a narrow frame and fast metabolism, the classic hardgainer phenotype.
Exercise Selection
Which exercises deliver maximum stimulus with minimal fatigue, SFR in practice.
F
1 termFood Hygiene
Strategies for better digestibility and tolerance, so more calories actually get absorbed.
G
4 termsGhrelin
The hunger hormone signals your brain when it is time to eat.
Glucagon
Insulin's antagonist, mobilizes glycogen and fatty acids when blood sugar drops.
Glycogen
Stored glucose in muscles and liver, your primary energy tank during training.
Growth Hormone
Somatotropin promotes tissue growth and recovery, released primarily during deep sleep.
H
3 termsHard Nutrition
The HGPN nutrition system, macros, timing and strategy specifically for hardgainers.
Hardgainer
People with high NEAT and low appetite who systematically struggle to gain weight.
Hypertrophy
Muscle growth through adaptation to mechanical tension, the core goal of your training.
I
3 termsIGF-1 (Insulin-like Growth Factor 1)
Insulin-like growth factor that drives muscle building and recovery via the GH-IGF axis.
Insulin
Storage hormone for glucose and nutrients, the key to nutrient partitioning.
Intensity vs. Effort
Objective load in percent of 1RM against subjective exertion via RPE and RIR, two different metrics.
J
1 termJunk Volume
Training volume without growth stimulus, generates only fatigue, no adaptation.
L
3 termsLean Surplus
Controlled surplus of 200 to 400 kcal, the balance between muscle gain and fat control.
Leptin
Satiety hormone from adipose tissue, regulates appetite and energy balance long-term.
Leucine Threshold
The minimum leucine level required to fully activate muscle protein synthesis.
M
15 termsMaintenance Calories
The calorie amount at which your weight stays stable, your energy equilibrium point.
MAV (Maximum Adaptive Volume)
The volume threshold at which your muscle growth is maximized.
Mechanical Tension
The primary hypertrophy driver, force on the muscle under controlled stretch.
Melatonin
Sleep hormone released in darkness, regulates your circadian rhythm.
Metabolic Stress
Secondary hypertrophy mechanism through metabolite accumulation during training.
Metabolism
The totality of all biochemical processes in your body, far more than fast or slow.
Metabolism System (BMR + NEAT + EAT + TEF)
System overview of BMR, NEAT, EAT and TEF, the foundation of your entire energy balance.
MEV (Minimum Effective Volume)
The minimum volume at which a measurable growth stimulus occurs at all.
MPB (Muscle Protein Breakdown)
Protein breakdown in muscle, the catabolic side of the protein balance.
MPS (Muscle Protein Synthesis)
Protein synthesis in muscle, the anabolic side you want to maximize.
MRV (Maximum Recoverable Volume)
The volume ceiling beyond which recovery can no longer keep up.
Muscle Damage and RBE
Mechanical tissue damage and the repeated bout effect that makes you more resilient.
Muscle Pump
Acute cell swelling from metabolites, feels great but is not a growth marker.
MV (Maintenance Volume)
The volume sufficient to maintain existing muscle mass during a break.
Myostatin
Your body's built-in growth brake, limits muscle building as a safety mechanism.
N
2 termsNEAT (Non-Exercise Activity Thermogenesis)
Energy expenditure from daily activity, often above average in hardgainers.
Noradrenaline / Adrenaline (Catecholamines)
Catecholamines activate the sympathetic nervous system for fight-or-flight responses.
P
2 termsProgressive Overload
Systematic increase of training load, the engine for long-term growth.
Protein
Macronutrient made of amino acids, building material for muscle with timing and quality.
R
5 termsRange of Motion (ROM)
How far you execute an exercise, critical for stimulus, technique and injury prevention.
Rate of Gain (RoG)
Your weekly rate of gain, the compass for a controlled building phase.
Rep Ranges
Rep ranges from 5 to 30 can trigger hypertrophy, proximity to failure decides.
RIR (Reps in Reserve)
Repetitions in reserve before failure, governs intensity and fatigue management.
RPE (Rate of Perceived Exertion)
Subjective effort scale from 1 to 10, a tool for autoregulation in training.
S
3 termsSet Structure (Straight vs. Top/Back-off Sets)
Set structure affects stimulus and fatigue profile, choose based on your training level.
SFR (Stimulus-to-Fatigue Ratio)
Ratio of growth stimulus to fatigue, determines exercise efficiency.
SRA (Stimulus, Recovery, Adaptation)
The timing framework for optimal training frequency, stimulus, recovery, adaptation.
T
8 termsTDEE (Total Daily Energy Expenditure)
Your total daily energy expenditure from BMR, NEAT, EAT and TEF.
Technical Failure vs. Muscular Failure
Form breakdown against total failure, where you should end the set.
TEF (Thermic Effect of Food)
Energy cost of digestion, protein-rich food has the highest TEF.
Tempo (Repetition Speed)
The speed of each repetition phase, affects time under tension and SFR.
Testosterone
Primary anabolic hormone, drives muscle building, recovery and motivation.
Thyroid Hormones (T3/T4)
Regulate basal metabolic rate and heat production, the key to metabolic pace.
Training Frequency (per Muscle Group)
How often per week you train a muscle group, influences volume distribution and SRA.
Training Volume and Fatigue System (MEV to Deload)
System overview from MEV to Deload, your framework for volume and fatigue management.
W
1 termWarm-up and Ramp-up Sets
Warm-up sets progressively increase load and prepare joints and nervous system.
Training
20 termsStimulus, volume, progression. Pillar page: Training for hardgainers
Nutrition
9 termsSurplus, density, distribution. Pillar page: Nutrition for hardgainers
Recovery
10 termsSleep, SRA, deload. Pillar page: Recovery for hardgainers
Physiology
19 termsMetabolism, hormones, appetite. Pillar page: Physiology for hardgainers
System
7 termsBaseline, tracking, iteration. Pillar page: System for hardgainers
Mindset
1 termIdentity, consistency, patience. Pillar page: Mindset for hardgainers
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Hardgainer glossary: common questions
How is the glossary structured?
Two views on the same terms. Alphabetical for fast access when you already know the term. By pillar when you are working your way into a topic. The pillars are exactly the six from the Knowledge Base, and every term has exactly one home.
Which pillar does a term belong to?
Every term is assigned to exactly one of the six pillars, its primary pillar. It still gets linked from several pages, because deload for example matters in training, in recovery and in the system. The assignment tells you where a term lives, not where it appears.
How does the search work?
The search filters in real time across term, description and stored synonyms. You can combine several words, for example neat energy expenditure. You can also click the topic chips inside the cards to filter directly. Escape clears the search.
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Where do the claims on the term pages come from?
Every term page has a section “What the research says” with the papers behind its claims, linked straight to PubMed. Each one also states what the studies do not cover. Where there is no solid number, there is no number.
What does the System label on some cards mean?
It marks system articles. Those are overview pieces that tie several individual terms into one framework, currently the Metabolism System and the Training Volume and Fatigue System. Reading those makes the individual terms click faster.
Where else do these terms appear?
On all six pillar pages of the Knowledge Base as term clusters, in the Hardgainer Guide, in the Calorie Calculator, in the Workout Plan Generator and in Myth Busting.
Is the glossary available in German?
Yes, the German Hardgainer Glossar carries the same terms with the same pillar assignment.
How often is the glossary expanded?
Continuously. New terms are added as soon as new articles, tools or myth-busting episodes go live. Existing entries are revised when the research changes.
Reading and resources
The pillars every term belongs to, and the pages that hold the system together.
This content is general practical guidance and does not replace individual medical or nutritional advice.
