Fitness Glossary for Women Over 40

Your one-rep max is the heaviest weight you can lift for a single full rep with good form. It is used to scale training percentages but is not necessary to test directly — estimated 1RMs work fine for programming.

AMRAP stands for "as many reps as possible" — performing a set until you cannot complete another rep with good form. Used sparingly, AMRAPs reveal real-world strength and progress.

Atrophy is the loss of muscle mass that occurs with disuse, illness, or aging. After 40, untrained muscle atrophies faster than at younger ages, which is why consistent loading matters more in midlife.

BMI is weight divided by height squared, used as a crude population-level health screen. It does not distinguish muscle from fat, which makes it a poor individual metric for strength-training women 40+.

BMR is the number of calories your body burns at complete rest to keep you alive. It declines with age and with muscle loss — which is why preserving muscle in midlife is the most effective way to protect metabolism.

A compound exercise moves multiple joints and trains several muscle groups at once — squats, deadlifts, presses, rows, and pull-ups are the classics. Compounds are the highest-leverage lifts for women 40+.

The concentric phase of a lift is when the muscle shortens under load — standing up out of a squat, curling the dumbbell toward the shoulder, pressing the bar overhead.

Cortisol is the body's primary stress hormone. In perimenopause, women become more cortisol-sensitive, so over-exercising, under-sleeping, and chronic stress disproportionately drive belly fat and muscle loss.

DOMS is the muscle soreness that peaks 24–72 hours after unfamiliar or eccentric-heavy training. It is not a reliable marker of a good workout — consistent progressive overload matters more than soreness.

The eccentric phase is when the muscle lengthens under load — lowering down into a squat, releasing a curl, or descending in a push-up. Eccentric work is highly effective for muscle and tendon health.

EMOM means "every minute on the minute" — at the start of each minute, you complete a set number of reps, then rest for the remainder of the minute. It is a way to add density without random pacing.

Estrogen is the primary female sex hormone, protective of muscle, bone, brain, and cardiovascular health. Its erratic decline in perimenopause is the root cause of most midlife training and metabolic shifts.

Hypertrophy is the increase in muscle size that results from training. For women 40+, hypertrophy training (8–12 reps, multiple sets, taken close to failure) directly counters age-related muscle loss.

Insulin sensitivity is how effectively your cells respond to insulin to clear glucose from the bloodstream. It falls with age and estrogen decline; resistance training and Zone 2 cardio are the most reliable ways to restore it.

An isolation exercise moves a single joint and targets a single muscle — bicep curls, leg extensions, and lateral raises are examples. They are useful as accessory work after compound lifts.

An isometric contraction holds the muscle at a fixed length, with no movement — planks, wall sits, and dead hangs are isometrics. They build joint-position strength and tendon stiffness.

Lactic acid (more accurately, lactate) is a metabolic byproduct produced when the body breaks down glucose without enough oxygen. It is not what causes next-day soreness — that is DOMS.

Periodization is the planned variation of training volume, intensity, and focus over weeks and months. For women 40+, simple periodization with regular deloads outperforms grinding the same workouts indefinitely.

Plyometrics are explosive jumping or bounding movements (box jumps, broad jumps, hops) that use the stretch-shortening cycle to develop power. Low-volume plyos are excellent for bone density in women 40+.

Proprioception is your body's sense of its own position in space — how you know where your foot is without looking. It declines with age and is one of the strongest predictors of fall risk after 60.

Muscle protein synthesis is the process by which the body builds new muscle tissue. It is triggered by resistance training and amino acids — especially leucine — and becomes less responsive with age.

A rep (short for repetition) is one complete execution of an exercise movement — for example, lowering and standing back up in a squat counts as one rep.

Range of motion is the distance a joint travels through during a movement. Training through a full ROM produces more muscle growth and better mobility than partial reps in almost every study.

RPE is a 1–10 scale rating how hard a set felt. RPE 10 is maximum effort with no reps left in the tank; RPE 7 means three reps left. It is a flexible alternative to fixed percentages of 1RM.

A set is a group of consecutive reps performed without significant rest. "3 sets of 10 reps" means doing 10 reps, resting, then repeating twice more.

A superset is two exercises performed back-to-back with little or no rest between them. They save time and add metabolic stress, often pairing opposing muscle groups (e.g., push + pull).

Tabata is a 4-minute high-intensity interval protocol — 20 seconds of all-out work, 10 seconds of rest, repeated 8 times. Best used sparingly in midlife due to its high cortisol cost.

TDEE is the total calories you burn in a day — BMR plus the calories from movement, digestion, and exercise. It is the most useful number for setting calorie targets, though estimates are rarely better than ±15%.

Testosterone is an anabolic hormone present in both sexes — women have about 10% of male levels. It declines steadily after 30, contributing to slower muscle building and reduced libido.

VO2 max is the maximum volume of oxygen your body can use during all-out exercise. It is one of the strongest predictors of all-cause mortality — improving it in midlife adds measurable years to healthspan.