Strength Training Glossary

The maximum weight you can lift for exactly one repetition.

Your one rep max is the heaviest weight you can move through the full range of motion for a single rep with good form. It's the gold standard for measuring absolute strength. You can test it directly or estimate it from a submaximal set using formulas like Epley or Brzycki — most lifters use the estimate to avoid excessive fatigue and injury risk.

A 1–10 scale for how hard a set felt, with 10 meaning absolute maximum effort.

RPE is a self-reported effort scale popularized in powerlifting. An RPE 10 means you had nothing left; RPE 8 means you could have done 2 more reps; RPE 6 means roughly 4 reps were still in the tank. It lets coaches and athletes prescribe and communicate training intensity without constantly testing a 1RM. In practice, RPE is closely related to RIR — an RPE 8 equals roughly 2 reps in reserve.

How many more reps you could have done before hitting failure.

RIR is the flip side of RPE: instead of rating effort on a scale, you count how many reps you had left. A set of 10 squats with 2 RIR means you stopped with 2 clean reps still available before muscular failure. Research shows RIR is a reliable way to auto-regulate load and keep sets productive without accumulating excessive fatigue. GainsLog uses RIR logging to build your adaptive targets.

Systematically increasing training stress over time to force continued adaptation.

Progressive overload is the foundational principle behind all long-term strength and muscle gains. Your body adapts to the stress you impose on it; once it adapts, the same stress produces no further gains. To keep progressing you must gradually increase the challenge — typically by adding weight, reps, sets, or reducing rest. The key word is systematic: random fluctuations don't count. A planned, trackable progression applied week-to-week is what drives measurable results.

The growth of muscle fibers in size, the primary goal of bodybuilding-style training.

Hypertrophy refers to an increase in muscle fiber cross-sectional area. It happens when mechanical tension, metabolic stress, and muscle damage signal the body to synthesize new contractile proteins. Hypertrophy training typically targets moderate rep ranges (6–20), controlled eccentrics, and sufficient volume spread across the week. Unlike strength training, which also involves neural adaptations, hypertrophy is purely about making muscles physically larger.

Total training work, usually measured as sets × reps × load.

Training volume is one of the most powerful drivers of hypertrophy. It can be expressed as total tonnage (kg lifted), hard sets per muscle per week, or weekly set counts. Research consistently shows a dose-response relationship up to a recoverable limit: more volume produces more muscle — until recovery can't keep up. Most evidence-based programs track weekly sets per muscle group as the key volume metric, aiming for roughly 10–20 productive sets per muscle per week depending on training age and recovery capacity.

How heavy the load is relative to your maximum, typically expressed as a percentage of 1RM.

In strength training, intensity means load as a fraction of your 1RM — not how hard a workout felt colloquially. An 80% intensity means you're lifting 80% of your one rep max. Intensity determines the type of adaptation: heavy loads (>85% 1RM) favor neural adaptations and maximal strength; moderate loads (60–85%) are the sweet spot for hypertrophy; lighter loads (<60%) build local muscular endurance. Periodization manipulates intensity over time to peak performance at the right moment.

How often you train a muscle group per week.

Training frequency refers to how many times per week you expose a muscle to sufficient stimulus. For hypertrophy, most research supports training each muscle group at least twice per week. Higher frequency (2–3×) allows you to spread your weekly volume across more sessions, reducing per-session fatigue and potentially improving technique. Lower frequency programs can work if weekly volume is adequate, but single-session volume has diminishing returns past a point.

A training block of 4–8 weeks focused on a specific goal, like building muscle or peaking strength.

A mesocycle is the middle layer of periodization planning. It typically spans 4–8 weeks and has a defined objective: accumulating volume for hypertrophy, building maximal strength, or peaking for a competition. Each mesocycle usually progresses in some variable each week (e.g., adding sets or increasing load), then ends with a deload before the next block begins. Thinking in mesocycles prevents aimless training and ensures long-term progression.

A single training week — the smallest repeating planning unit.

The microcycle is your week-to-week training schedule. It specifies which sessions happen on which days, what muscles are trained, and in what order. Within a mesocycle, each microcycle is a variation on a template — you might increase sets by one or add a little weight from week to week. Planning at the microcycle level makes it easy to adjust around life without losing the bigger picture.

The complete long-term training plan, usually spanning a full year or competitive season.

The macrocycle is the highest level of program design: the full 6–12 month plan that strings multiple mesocycles together toward a peak goal. For competitive athletes, the macrocycle runs from the start of off-season prep to the last competition of the year. For recreational lifters, it might mean a hypertrophy block, a strength block, and a maintenance phase across a year. The macrocycle keeps each mesocycle purposeful by showing how it fits the bigger picture.

A planned week of reduced training stress to allow full recovery before the next training block.

A deload is a deliberate reduction in training load — typically dropping volume and/or intensity for one week — to let accumulated fatigue dissipate and supercompensation occur. It's not a rest week; you still train, just at reduced intensity. Deloads are built into program design at the end of mesocycles to arrive at the next block fully recovered and ready to push harder. Skipping deloads can lead to accumulated fatigue masking fitness and eventually to overtraining.

Systematic variation of training variables over time to optimize long-term performance.

Periodization is the strategic manipulation of volume, intensity, and frequency across time to avoid accommodation and peak fitness when it matters most. Linear periodization increases load while decreasing reps week to week. Daily undulating periodization (DUP) varies intensity and rep targets within a single week. Block periodization isolates training qualities into focused mesocycles. All forms share the same core idea: planned variation prevents stagnation and drives continued adaptation.

An exercise that recruits multiple joints and large muscle groups simultaneously.

Compound movements — like the squat, deadlift, bench press, overhead press, and pull-up — involve two or more joints working together. They recruit large amounts of muscle mass, allow heavy loading, and produce strong hormonal and neural responses. Most evidence-based programs center their training around compound movements for these reasons, then supplement with isolation work to address weak points or add targeted volume.

An exercise that targets a single joint and focuses stress on one muscle group.

Isolation exercises — curls, tricep pushdowns, lateral raises, leg curls — move through a single joint and direct almost all tension to the target muscle. They're used to add volume to muscles that don't get enough work from compound movements, address weak links, or improve the mind-muscle connection. They complement rather than replace compound lifts in a well-rounded program.

Two exercises performed back-to-back with no rest between them.

A superset pairs two exercises performed consecutively before resting. Antagonist supersets pair opposing muscle groups — like bicep curls and tricep pushdowns — allowing one muscle to recover while the other works. This can improve training density and save time. Agonist supersets (two exercises for the same muscle) increase metabolic stress and fatigue, which may enhance hypertrophy but limits the load you can use.

A set continued past initial failure by immediately reducing the weight and doing more reps.

A drop set extends a set by stripping weight (typically 20–30%) the moment you reach failure and immediately continuing. This allows more total reps and greater metabolic stress than a standard set. Drop sets are an intensity technique — they work best as a finisher at the end of a session or muscle group, not as a replacement for progressive overload. Used sparingly, they can add productive volume when time is limited.

Performing as many reps as possible in a set, often used to test strength or auto-regulate load.

AMRAP sets push to technical failure — the point where form breaks down — within a given set. They're used to test progression (if you hit more reps than last week at the same weight, you're stronger), to auto-regulate load adjustments, and to max out volume in the final set of an exercise. In strength programs, AMRAP sets on the last work set are a common way to accumulate extra volume while measuring readiness.

The total time a muscle is loaded during a set, controlled by rep tempo.

Time under tension describes how long the target muscle is under load during a set, governed by rep tempo (e.g., 3 seconds down, 1 second pause, 1 second up). Slower eccentrics increase TUT, mechanical tension, and metabolic stress — all drivers of hypertrophy. In practice, controlled eccentrics (2–3 seconds) are well-supported for muscle growth. Ultra-slow protocols (10+ seconds per rep) haven't shown consistent benefits over moderate tempos.

Adding weight to the bar every session or every week — the simplest form of progressive overload.

Linear progression is the most straightforward overload model: you add a small fixed amount of weight (e.g., 2.5 kg) every session or every week. It works best for beginners, who can recover fast enough to progress that frequently. Most beginner programs — Starting Strength, StrongLifts 5×5 — are built on linear progression. As you become more advanced, recovery slows and you need longer cycles (weekly or monthly progression) to keep making gains.