Training terms.
Protocol Glossary.
Science-backed definitions for every term in your health data: plain English and the mechanism behind it.
54 terms in Training
A
6 terms
- Acute:Chronic Workload Ratio (ACWR)The ratio that separates productive overload from injury risk
- Aerobic BaseThe accumulated low-intensity fitness that lets you work harder, longer, and recover faster.
- Aerobic Threshold (AeT)The Zone 2 ceiling: where fat starts ceding to carbohydrates
- Allostatic LoadYour total accumulated stress burden: the body cannot separate the sources
- Anaerobic Threshold (AT)The intensity ceiling where fat fuel gives out
- ATP-PCr SystemThe immediate, oxygen-free energy system that powers your first 10 to 15 seconds of maximal effort.
C
3 terms
- CO2 ToleranceHow much carbon dioxide your body can tolerate before the brain triggers an urgent need to breathe.
- Compound vs. Isolation ExercisesLifts that move several joints and muscles at once, versus lifts that isolate one joint to train a single muscle directly.
- Concurrent TrainingThe interference effect between strength and endurance training
H
3 terms
- HIIT (High-Intensity Interval Training)Short bursts of hard effort for cardiovascular adaptation
- HormesisThe biological principle that small, controlled doses of stress trigger adaptive responses that make your body stronger and more resilient.
- HypertrophyThe structural enlargement of muscle fibers in response to training stress
M
6 terms
- Mind-Muscle ConnectionThe conscious practice of focusing on and feeling a target muscle work during a lift, which changes how many fibers in that muscle activate.
- Mitochondrial BiogenesisGrowing new mitochondria: the cellular adaptation that drives aerobic fitness
- Mobility vs. FlexibilityTwo different physical capacities people use interchangeably, and only one of them requires strength.
- Motor Unit RecruitmentHow your nervous system scales force output
- Muscle Memory (Myonuclei)Why returning to training after a break is faster than starting fresh
- Muscle Protein Synthesis (MPS)The cellular process that builds and repairs muscle
P
3 terms
- PeriodizationThe structured organization of training stress and recovery across time
- Plyometric TrainingExplosive stretch-shortening exercises like jumps and bounds that train muscles to produce force fast, not just powerfully
- Progressive OverloadThe principle that drives all adaptation: consistently increase the demand to keep improving
S
3 terms
- SAID PrincipleThe principle that your body adapts specifically to the type, intensity, and pattern of stress placed on it, not to exercise in general.
- Strength-to-Weight RatioHow much force you can produce relative to your own body mass
- SupercompensationThe overshoot above baseline that makes training produce fitness
T
8 terms
- Tempo TrainingControlling rep speed to change the training stimulus without changing the weight
- Tendon AdaptationHow tendons remodel their collagen structure in response to mechanical loading, distinct from muscle growth
- Time Under TensionThe total number of seconds a muscle spends under load during a set, a duration metric distinct from reps or weight
- Training FrequencyHow often you train a given muscle group or movement pattern each week, independent of total volume or load.
- Training IntensityHow heavy or hard a given set or session is relative to your maximum effort.
- Training LoadThe cumulative stress of your recent training
- Training VolumeThe total amount of work performed in training, most often counted as sets per muscle group or total load lifted.
- TRIMP (Training Impulse)A single number for quantifying training stress
U
2 terms
More terms added regularly. Check back for new entries across all categories.
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