How training works
115 short articles on the methods behind a training plan, what the research says about each and who it suits.
Overview guides
- Cardio Methods Compared: From Easy Steady Work to All-Out IntervalsA side-by-side comparison of LISS, MICT, Zone 2, HIIT, sprint intervals, Tabata and fartlek, with each method's intensity and session length and best use.3 minute read
- How a Training Program Is BuiltA plain overview of how a training program is built, from goals and the four basic variables to progression and recovery, and where each method and theory article fits.4 minute read
- Resistance Training Methods ComparedA comparison of resistance training methods including supersets, drop sets, cluster sets, rest-pause, myo-reps, German volume training, density training and isometrics, with what each is for.3 minute read
- Stretching and Mobility Methods ComparedA side-by-side comparison of static, dynamic, ballistic and PNF stretching, foam rolling, mobility flows and loaded stretching, with when each is used and what the evidence shows.3 minute read
- What Is Periodization?What periodization means, how linear, undulating, block and conjugate models differ, what meta-analyses say about periodized plans and how to choose.3 minute read
Cardio and conditioning methods
- Fartlek: Unstructured Speed Play Within a Continuous RunWhat fartlek training is, where it comes from, how to structure a session and who it suits.4 minute read
- HIIT: High-Intensity Interval Training ExplainedWhat HIIT is, how work and rest intervals are structured, what research shows against steady cardio and who should be careful with it.4 minute read
- LISS: Low-Intensity Steady State Cardio ExplainedWhat low-intensity steady state cardio is, what heart rate it uses, what it does for the body and how to fit it into a week.4 minute read
- MICT: Moderate-Intensity Continuous Training ExplainedWhat moderate-intensity continuous training is, how it differs from easy and hard cardio, what it improves and how to use it.4 minute read
- Sprint Interval Training: All-Out Efforts With Long RestWhat sprint interval training is, how it differs from HIIT, what the research found about very short workouts and who it suits.4 minute read
- Tabata: The 20-Seconds-On, 10-Seconds-Off Interval FormatWhat the Tabata protocol is, where it comes from, what the original study found and how to use the format sensibly.4 minute read
- Zone 2 Training: Building an Aerobic Base at an Easy-to-Moderate EffortWhat Zone 2 training means, how to find your zone, what the evidence supports and where claims go beyond it.5 minute read
Resistance training methods
- Accentuated Eccentric Training: Emphasizing the Lowering PhaseWhat accentuated eccentric training is, why the lowering phase is special, what reviews found and how to use negatives safely.4 minute read
- AMRAP: As Many Rounds or Reps As PossibleWhat AMRAP means as a workout format and as a set type, how to use it for training and testing, and its drawbacks.4 minute read
- Blood Flow Restriction Training: Light Weights With a CuffWhat blood flow restriction training is, what the meta-analyses found on muscle growth with light loads, the safety issues and who might use it.4 minute read
- Circuit Training: Rotating Through Exercise StationsWhat circuit training is, how stations are organized, what the research found on fitness and body composition and how to design a circuit.4 minute read
- Cluster Sets: Breaking a Set Into Small Pieces With Short RestsWhat cluster sets are, why short intra-set rests can keep bar speed higher, what the 2021 meta-analysis found and how to program them.4 minute read
- Complex and Contrast Training: Pairing a Heavy Lift With an Explosive MoveWhat complex and contrast training are, how a heavy lift is paired with an explosive move, and what research says about rest times and results.4 minute read
- Density Training: Doing More Work in the Same Amount of TimeWhat density training means, how to measure it, why it is a way to progress without adding weight and where its limits are.4 minute read
- Drop Sets: Cutting the Weight to Keep Going Past FailureWhat drop sets are, how to run them, what the 2022 meta-analysis found on muscle growth and time saved and who should use them.4 minute read
- EMOM: Every Minute On the MinuteWhat an EMOM workout is, how rest works inside it, how to pick the work for each minute and when it is a good fit.4 minute read
- German Volume Training: The 10 Sets of 10 MethodWhat German Volume Training is, how the 10x10 layout works, what the one controlled trial found and whether it is worth using.4 minute read
- Isometric Training: Building Strength Without Moving the JointWhat isometric training is, the two main types, what a systematic review found on muscle length, intensity and intent and how to use holds.4 minute read
- Metabolic Resistance Training: Lifting With Short Rests to Raise Heart RateWhat metabolic resistance training is, how it differs from circuits and standard lifting, what research supports and who it suits.4 minute read
- Myo-Reps: An Activation Set Followed by Mini-SetsWhat myo-reps are, how an activation set and mini-sets work, what limited research shows and when the method is worth trying.4 minute read
- Pyramid Training: Changing the Weight and Reps From Set to SetWhat pyramid training is, the difference between ascending and descending pyramids, what limited research says and how to try one.4 minute read
- Rest-Pause Training: Short Breaks Inside a SetWhat rest-pause training is, how it differs from drop sets and myo-reps, what trials found and how to run a rest-pause set.4 minute read
- Supersets and Giant Sets: Two or More Exercises Back to BackWhat supersets and giant sets are, the main types, what meta-analyses show about time and muscle growth and how to use them.4 minute read
Hybrid methods
- Concurrent Training: Doing Strength and Endurance Work in One ProgramWhat concurrent training is, what the interference effect is, what two meta-analyses found about combining cardio and weights and how to schedule both.4 minute read
- CrossFit-Style Workouts: Varied Functional Movements at High IntensityWhat a CrossFit-style workout of the day is, the idea of general physical preparedness, what reviews say on injuries and who may want to try it.4 minute read
- Powerbuilding: Training for Strength and Muscle Size TogetherWhat powerbuilding is, how a session mixes heavy main lifts with higher-rep accessory work, and who benefits from the approach.4 minute read
Flexibility and mobility methods
- Ballistic Stretching: Using Momentum to Reach Past the Usual RangeWhat ballistic stretching is, how it differs from dynamic stretching, what the evidence says about its safety and who may use it.3 minute read
- Dynamic Stretching: Moving Through Range to Prepare for ExerciseWhat dynamic stretching is, how it differs from static and ballistic stretching, what research suggests for warm-ups and how to build a routine.3 minute read
- Foam Rolling: What Self-Massage with a Roller DoesWhat foam rolling is, what research shows about range of motion and soreness, why the fascia release claim is doubted and how to use a roller.4 minute read
- Loaded Stretching: Adding Weight to a Stretched PositionWhat loaded stretching is, why training at long muscle lengths is of interest, what the human evidence shows and how to try it.4 minute read
- Mobility Flow and CARs: Training Control Through Your RangeWhat mobility training is, how it differs from flexibility, what controlled articular rotations are and what is known about their effects.3 minute read
- PNF Stretching: Contracting a Muscle Before Stretching ItWhat PNF stretching is, how the contract-relax method works, what the evidence says about why it increases flexibility and how to try it.4 minute read
- Static Stretching: Holding a Stretch to Build Range of MotionWhat static stretching is, how long to hold a stretch, what research says about performance, injury and flexibility and when to schedule it.4 minute read
Balance and stability methods
- Core Stability Training: Teaching the Trunk to Resist MovementWhat core stability training is, what the core muscles do, what reviews show for back pain and performance and how to build a core routine.3 minute read
- Proprioceptive Training: Teaching the Body Where It Is in SpaceWhat proprioceptive training is, how it works, what research shows for ankle sprains and falls and how to build a balance routine.3 minute read
- Single-Limb Training: Working One Side at a TimeWhat single-limb training is, why unilateral exercises are used, what research suggests about strength and imbalances and how to program them.4 minute read
- Vestibular Training: Exercises for the Balance System of the Inner EarWhat vestibular training is, how the inner ear contributes to balance, what research supports in dizziness and what the evidence is for healthy people.3 minute read
Speed, agility and power methods
- Olympic Lifting Derivatives: Cleans, Snatches and Their VariationsWhat Olympic lifting derivatives are, why athletes use them to build power, what a meta-analysis found for jump height and how to learn them safely.3 minute read
- Plyometric Training: Jumping and Bounding to Build Explosive PowerWhat plyometric training is, how the stretch-shortening cycle works, what research shows for jump height and how to set safe volume.3 minute read
- Reactive Agility Training: Moving in Response to What HappensWhat reactive agility training is, why decision-making matters in movement, what research shows and how to build reaction drills safely.3 minute read
- Resisted and Assisted Sprint Training: Making Sprinting Harder or Easier on PurposeWhat resisted and assisted sprint training are, how sleds, hills and towing are used, what reviews show on sprint speed and how to choose loads.3 minute read
- SAQ Training: Speed, Agility and QuicknessWhat SAQ training is, how speed, agility and quickness differ, what research says about change of direction skill and how to build a session.3 minute read
Coordination methods
- Complex and Combination Movement Training: Linking Movements TogetherWhat complex movement training is, how combination movements challenge coordination, what research suggests and how to build a simple sequence.3 minute read
- Motor Learning Progressions: Building a Movement Skill Step by StepWhat motor learning progressions are, how to break a complex movement into learnable steps, what research says about feedback and practice and how to apply it.3 minute read
- Reaction Training: Practicing Fast Responses to a SignalWhat reaction training is, how reaction time is measured, what research says about whether it can be trained and how to practice it.3 minute read
Body composition
- Body Recomposition: Losing Fat and Building Muscle TogetherWhat body recomposition is, who can build muscle and lose fat together, what protein and training factors the research supports and how to set it up.3 minute read
- Calorie and Carb Cycling: Varying Intake Across the WeekWhat calorie and carb cycling are, how refeeds and high and low days work, what the research shows and who might find the approach useful.3 minute read
- NEAT: The Energy You Burn Outside the GymWhat NEAT is, how everyday movement adds to energy use, what research found about differences between people and how to raise it.3 minute read
Recovery
- Active Recovery: Light Movement Between Hard SessionsWhat active recovery is, what research says about light movement after hard exercise, how it compares with rest and massage and how to use recovery days.3 minute read
- Contrast Therapy: Alternating Hot and Cold for RecoveryWhat contrast therapy is, how alternating hot and cold water is used for recovery, what reviews found on soreness and how cold may affect muscle growth.3 minute read
- HRV-Guided Training: Adjusting Workouts to a Daily Readiness SignalWhat heart rate variability is, how HRV-guided training adjusts workouts to readiness, what reviews found and how to measure it.3 minute read
- Sleep and Recovery: Why Rest at Night Shapes Training ResultsHow sleep affects training recovery, performance and injury risk, what research shows about sleep loss and extra sleep and how to protect sleep.3 minute read
Programming models
- Autoregulation and RPE: Letting the Day Set the LoadWhat autoregulation is, how RPE, reps in reserve and bar speed adjust training load day to day, what the evidence shows and how to start.3 minute read
- Block Periodization: Focusing on One Quality at a TimeWhat block periodization is, how accumulation, transmutation and realization blocks work, what the evidence shows and who benefits.3 minute read
- Deload Weeks: Planned Reductions in Training StressWhat a deload week is, how it differs from a taper and from rest, what an expert consensus and a trial suggest and how to plan one.3 minute read
- Linear Periodization: Moving From Volume Toward Intensity Over MonthsWhat linear periodization is, how volume falls and intensity rises across phases, what a meta-analysis found about periodized plans and how to set one up.4 minute read
- Reverse Linear Periodization: Starting Heavy and Ending With VolumeWhat reverse linear periodization is, how it differs from the traditional order, what limited research shows and who might use it.3 minute read
- Tapering: Easing Training Before an Important EventWhat a taper is, how reducing volume while keeping intensity helps performance, what a meta-analysis found and how to plan one.3 minute read
- The 5/3/1 Program: Slow, Steady Strength ProgressWhat the 5/3/1 program is, how the training max and weekly rep schemes work, what is known about its evidence and who it suits.3 minute read
- The Conjugate Method: Training Several Strength Qualities Every WeekWhat the conjugate method is, how max effort, dynamic effort and repetition days work, what evidence exists and who uses it.3 minute read
- Training Splits: How to Divide Work Across the WeekWhat training splits are, how full-body, upper-lower and push-pull-legs plans compare, what research says about frequency and volume and how to choose.3 minute read
- Undulating Periodization: Changing the Load and Reps From Session to SessionWhat undulating periodization is, how a week of it looks, what studies show about strength and muscle growth, and who it suits.6 minute read
Skill practice structures
- Blocked Practice: Repeating One Skill Before Moving OnWhat blocked practice is, why repeating one movement helps early learning, what research says about its limits and how to combine it with varied practice.3 minute read
- Distributed Practice: Spreading Practice Across TimeWhat distributed practice is, why spreading practice across time helps memory and skill, what research shows and how to schedule practice in training.3 minute read
- Massed Practice: Concentrated Practice With Little RestWhat massed practice is, how it compares with spreading practice over time, what research found about fatigue, learning and skill type and when it may be useful.3 minute read
- Random and Variable Practice: Mixing Skills for Longer-Lasting LearningWhat random and variable practice are, why mixing skills slows early progress but helps retention, what research shows and how to apply it in training.3 minute read
Populations and timing
- Long-Term Athlete Development: Planning Training Across the Years of GrowthWhat the long-term athlete development model is, how it describes stages from childhood to adulthood, what critics say and how to apply the useful parts.3 minute read
- Menstrual Cycle Periodization: Planning Training Around the CycleWhat menstrual cycle-based training is, what the phases are, what two reviews found about performance and why cycle syncing is not yet proven.3 minute read
- Resistance Training for Sarcopenia: Keeping Muscle and Strength With AgeWhat sarcopenia is, how resistance training helps older adults keep strength and muscle, what research shows and how to start safely.4 minute read
- Time-of-Day Training: Does the Clock Matter?Whether morning or evening training is better, what a meta-analysis found about strength and muscle growth, and how to choose a time that suits you.3 minute read
Training principles
- The FITT Principle: Four Dials for Describing and Adjusting ExerciseWhat the FITT principle is, how frequency, intensity, time and type describe any workout, how guidelines use it and how to apply it to your plan.3 minute read
- The Principle of Individuality: Why the Same Program Gives Different ResultsWhat the principle of individuality says, how much people differ in their response to the same training, what the research shows and how to personalize a plan.3 minute read
- The Principle of Specificity: You Get Better at What You PracticeWhat the principle of specificity says, how training adaptations depend on the exact movement, speed and energy system used, and how to choose exercises for a goal.3 minute read
- The Principle of Variation: Changing Training Without Losing the ThreadWhat the principle of variation says, why planned changes in training help, what a review found about changing exercises and how to vary without losing progress.3 minute read
Energy systems
- Energy Systems: How the Body Fuels Different Kinds of EffortHow the body produces energy for exercise through three systems, why all three work at once, and how knowing them helps you plan intervals and rest.4 minute read
- The ATP-PCr System: Energy for the First Seconds of Hard EffortWhat the ATP-PCr system is, how phosphocreatine fuels the first seconds of hard effort, how long it takes to recover and what creatine supplements do.3 minute read
- The Crossover Concept: How the Fuel Mix Changes With IntensityWhat the crossover concept says about how the body switches from fat to carbohydrate as exercise gets harder, what fat max means and what it implies for training.3 minute read
- The Glycolytic System: Fast Energy From CarbohydrateWhat the glycolytic system is, how it makes energy from carbohydrate without oxygen, what lactate really does and how to train efforts of 30 seconds to 2 minutes.3 minute read
- The Oxidative System: Sustained Energy With OxygenWhat the oxidative energy system is, how mitochondria make ATP using oxygen, how VO2max and fat use relate, and how aerobic training improves it.3 minute read
Adaptation theory
- General Adaptation Syndrome: A Stress Model Borrowed by TrainingWhat the general adaptation syndrome is, how Hans Selye's three stages were applied to training, and why critics say the model is a loose fit for exercise.3 minute read
- Matveyev's Periodization Theory: The Origin of Training CyclesWhere periodization came from, what Lev Matveyev proposed about training cycles, how macrocycles and mesocycles work and what critics say about the model today.3 minute read
- Progressive Overload: Gradually Asking More of the BodyWhat progressive overload is, the ways to apply it besides adding weight, what guidelines say about how much to increase and how to track it.3 minute read
- Reversibility: What Happens to Fitness When Training StopsWhat the reversibility principle says about losing fitness when training stops, how fast strength and endurance fade and how little training can maintain them.4 minute read
- Supercompensation: The Idea Behind Timing Hard Training and RestWhat supercompensation means in training, how recovery timing is meant to work, what is and is not supported by evidence, and how to use the idea sensibly.6 minute read
- The Fitness-Fatigue Model: Performance as Fitness Minus FatigueWhat the fitness-fatigue model is, how fitness and fatigue combine to give performance, how it explains tapering and what its limits are.4 minute read
- The SAID Principle: Tissues Adapt to the Demands Placed on ThemWhat the SAID principle says about how muscle, bone and tendon adapt to the demands placed on them, how it relates to specificity and what its limits are.3 minute read
- Verkhoshansky and Issurin: The Theory Behind Block TrainingThe ideas behind block training, from Yuri Verkhoshansky's concentrated loading to Vladimir Issurin's residual training effects, and what the evidence supports.3 minute read
Hypertrophy theory
- Mechanical Tension: The Main Signal for Muscle GrowthWhat mechanical tension is, why it is considered the main driver of muscle growth, how load, range of motion and effort relate to it and what research shows.4 minute read
- Metabolic Stress: The Burn and the PumpWhat metabolic stress is, how the pump and burn relate to muscle growth, what evidence supports a role and why it is considered secondary to mechanical tension.3 minute read
- Muscle Damage and Soreness: Does a Sore Muscle Mean Growth?What exercise-induced muscle damage is, why soreness appears one to two days later, whether damage helps growth and what the repeated bout effect means.3 minute read
- The Size Principle: Which Muscle Fibers Work, and WhenWhat the Henneman size principle says about how motor units are recruited from small to large, why it matters for light and heavy lifting and what limits it has.4 minute read
- The Three Mechanisms of Hypertrophy: An Overview of How Muscles GrowHow muscle growth is triggered, what the three proposed mechanisms of mechanical tension, metabolic stress and muscle damage mean and how much is actually known.4 minute read
- Volume Landmarks: How Many Sets Per Muscle Per WeekWhat volume landmarks are, how many sets per muscle per week research supports and how the minimum, optimal and maximum recoverable volume ideas are used.3 minute read
Neuromuscular theory
- Autogenic Inhibition: The Golgi Tendon Organ ReflexWhat autogenic inhibition and the Golgi tendon organ are, how the reflex works, why the popular stretching explanation is weaker than it sounds and what the evidence says.3 minute read
- Bondarchuk's Exercise Classification: Sorting Exercises by Their Transfer to the SportWhat Anatoliy Bondarchuk's exercise classification is, how exercises are sorted by closeness to the sport and what is known about transfer of training.3 minute read
- Post-Activation Potentiation: Can a Heavy Lift Prime an Explosive Movement?What post-activation potentiation is, how a heavy lift may boost a following explosive movement, what meta-analyses suggest about rest and why results vary.3 minute read
- Reciprocal Inhibition: How Muscles Coordinate in Opposing PairsWhat reciprocal inhibition is, how contracting one muscle relaxes its opposite partner, how it appears in movement and stretching and what research supports.3 minute read
- The Force-Velocity Relationship: Why Heavy Moves Slowly and Fast Moves LightWhat the force-velocity relationship is, why heavy loads move slowly and light loads fast, how power is calculated and how force-velocity profiling is used in training.3 minute read
- The Interference Effect: Does Endurance Training Blunt Strength Gains?What the interference effect is, how AMPK and mTOR signaling may conflict, what the research found and why interference may be smaller in practice than in theory.3 minute read
- The Length-Tension Relationship: Muscle Force Depends on LengthWhat the length-tension relationship is, how a muscle's force depends on its length, what it means for exercise range of motion and strength curves.3 minute read
- The Stretch-Shortening Cycle: Why a Quick Dip Makes You Jump HigherWhat the stretch-shortening cycle is, how tendons and reflexes boost jumping and running, the difference between fast and slow cycles and how it relates to plyometrics.3 minute read
Motor learning theory
- Dynamic Systems Theory: Movement as Self-OrganizationWhat dynamic systems theory says about how coordinated movement emerges, the degrees of freedom problem, what phase transitions show and how it influences coaching.3 minute read
- Ecological Dynamics: Skill as a Relationship Between Athlete and EnvironmentWhat ecological dynamics and the constraints-led approach are, how task, environment and performer constraints shape movement, and how coaches use them.3 minute read
- Fitts and Posner's Three Stages of Learning a SkillWhat the three Fitts and Posner stages of motor learning are, how practice and feedback change from beginner to expert and how coaches use the model.3 minute read
- The Contextual Interference Effect: Why Harder Practice Can Teach MoreWhat the contextual interference effect is, the two main explanations for why mixed practice aids retention, what the research found and where it is weaker.3 minute read
Overtraining and recovery theory
- Overreaching and Overtraining: A Spectrum of Training StressWhat overreaching and overtraining syndrome are, how they differ in timeline and recovery, what warning signs to watch and what a consensus statement says.3 minute read
- The Autonomic Nervous System and RecoveryHow the sympathetic and parasympathetic branches of the nervous system shape exercise and recovery, what heart rate recovery shows and what is known about monitoring.4 minute read
Behavior and adherence
- Implementation Intentions: If-Then Plans for ExerciseWhat implementation intentions are, how an if-then plan helps you follow through on exercise, what meta-analyses show and how to write one.3 minute read
- Self-Determination Theory: Why Some People Keep ExercisingWhat self-determination theory says about motivation, how autonomy, competence and relatedness support lasting exercise habits and how to apply it to your own routine.3 minute read
- The Habit Loop: Making Exercise AutomaticHow the cue, routine and reward habit loop works, how long habits take to form according to a real-world study and how to build an exercise habit.3 minute read