Glossary
Browse Titan Health glossary definitions and terminology
HRV
Heart rate variability (HRV) is the variation in time between consecutive heartbeats, measured in milliseconds.
Acute to Chronic Workload Ratio
The acute to chronic workload ratio (ACWR) is your training load over the last 7 days divided by your average weekly load over the last 28 days.
Auto-Regulation
Auto-regulation is the adjustment of training variables in real time based on your current readiness and performance response..
Deload Week
A deload week is a planned reduction in training stress used to dissipate accumulated fatigue while maintaining key movement patterns.
Macrocycle
A macrocycle is the longest planned training phase, usually spanning several months up to a full season.
Mesocycle
A mesocycle is a focused training block, usually 3 to 8 weeks, designed to target a specific adaptation priority.
Microcycle
A microcycle is the shortest structured planning unit in periodized training, usually one week.
Periodization
Periodization is the structured organization of training stress across time so different adaptations are developed in a logical sequence.
Polarized Training
Polarized training is an endurance training intensity distribution in which about 75 to 80 percent of sessions stay below your first lactate threshold, most of the rest go above your second threshold, and very little time is spent between the two.
Rate of Adaptation
Rate of adaptation is the speed at which your performance capacity changes in response to training and recovery inputs..
Training Frequency
Training frequency is how often you train a movement pattern, muscle group, energy system, or full session type within a week.
Training Intensity
Training intensity is how hard the work is relative to your current capacity.
Training Log
A training log is a structured record of workouts, recovery context, and key performance indicators used to guide data-driven-training decisions..
Training Split
A training split is the way training work is distributed across days, movement patterns, or muscle groups within a week to match training-frequency targets..
Training Volume
Training volume is the total amount of work completed over a defined period.
TRIMP
TRIMP, short for training impulse, is a single number for how much physiological work a session cost you, calculated by multiplying how long you trained by how hard your heart was working.
Hydration
Hydration is the maintenance of adequate body-water status to support physiological function, performance, and recovery..
Metabolism
Metabolism is the total set of biochemical processes that convert nutrients into energy and tissue-building substrates needed for life and performance, including basal-metabolic-rate demands..
Net Calories
Net calories are your calorie intake minus estimated exercise or activity calories, depending on the app definition you use.
Active Calories
Active calories are the estimated calories you expend above resting metabolism through movement and exercise.
Basal Calories
Basal calories are the calories your body uses at rest to maintain core life functions such as breathing, circulation, temperature regulation, and cellular maintenance.
Basal Metabolic Rate
Basal metabolic rate (BMR) is the energy your body uses at complete rest over 24 hours to sustain vital function.
Baseline
A baseline is your own typical value for a body measurement, such as overnight HRV or sleeping heart rate, calculated from your recent history together with how much that value normally varies from day to day.
Blood Oxygen
Blood oxygen, written SpO2, is the percentage of hemoglobin in your arterial blood that is carrying oxygen, estimated by a pulse oximeter from how your blood absorbs red and infrared light.
Body Composition
Body composition describes the proportions of fat mass, lean tissue, bone, and body water.
Body Fat Percentage
Body fat percentage is the proportion of total body mass that is fat tissue.
Body Mass Index
Body mass index (BMI) is a screening ratio calculated from body mass and height as kg/m^2.
Heart Rate Zones
Heart rate zones are bands of beats per minute that divide exercise intensity into steps, usually three or five, each defined as a share of your maximum heart rate, your heart rate reserve, or the heart rate at a measured metabolic threshold.
Max Heart Rate
Max heart rate is the highest number of beats per minute your heart can reach during an all-out effort.
Respiratory Rate
Respiratory rate is the number of breaths you take per minute.
Resting Heart Rate
Resting heart rate (RHR) is the number of times your heart beats per minute while you are awake, still and relaxed, with no recent exercise, stress or large meal pushing it up.
RMSSD
RMSSD, the root mean square of successive differences, is a heart rate variability statistic that measures how much the gap between one heartbeat and the next changes from beat to beat, reported in milliseconds.
SDNN
SDNN is the standard deviation of the intervals between normal heartbeats, measured in milliseconds.
Step Count
Step count is the number of steps you take over a day.
VO2 Max
VO2 max is the highest rate at which your body can take in, deliver and use oxygen during all-out exercise, usually reported in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min).
Wrist Temperature
Wrist temperature is the temperature of the skin under your watch, measured while you sleep and reported as a change from your own usual level.
Functional Fitness
Functional fitness is training that improves physical capacity for real-world tasks and role-specific demands, including lifting, carrying, moving, and sustaining effort with control..
Interval Training
Interval training alternates planned work bouts and recovery bouts to target specific energy systems with higher precision than continuous training, and the quality of each rest-interval determines repeatability..
Plyometrics
Plyometrics are explosive exercises that use rapid stretch-shortening cycles to improve power, reactivity, and force production rate..
Rest Interval
A rest interval is the planned recovery period between repetitions, sets, or work bouts.
RPE
RPE stands for rating of perceived exertion, a scale that captures how hard a set, interval, or session feels relative to your current capacity..
Sprint Intervals
Sprint intervals are brief, near-maximal or maximal efforts repeated with planned recovery periods to develop speed, anaerobic power, and high-intensity repeatability..
Tempo Training
Tempo training is sustained or repeat work at a controlled moderately hard intensity, typically below upper threshold, designed to improve aerobic durability and pace control..
Workout Density
Workout density is the amount of work performed per unit of time within a session.
Biofeedback
Biofeedback is the use of real-time physiological signals to help you regulate behavior, effort, or recovery responses..
Data Visualization
Data visualization is the graphical presentation of training and recovery data to make patterns, deviations, and trends easy to interpret..
Data-Driven Training
Data-driven training is the use of structured performance and recovery data from sources such as a training-log to guide programming decisions instead of relying only on intuition..
Fitness Dashboard
A fitness dashboard is a structured interface that aggregates training, recovery, and behavior metrics into a decision-ready view..
Wearable Devices and Metrics
Wearable devices are sensors you wear on the body, usually a watch, a ring or a chest strap, that record your heart activity and movement and sometimes your skin temperature and blood oxygen.
Core Strength
Core strength is the ability of trunk and pelvic musculature to generate and transfer force while maintaining positional control under dynamic load in patterns such as the deadlift..
Eccentric Training
Eccentric training emphasizes the lengthening phase of muscle action, where muscle produces force while being stretched under load..
Hypertrophy
Hypertrophy is the increase in muscle fiber size from repeated training and recovery cycles.
Muscle Memory
Muscle memory is the phenomenon where previously trained strength and muscle size are regained faster after a break than they were gained initially, even after measurable detraining..
Progressive Overload
Progressive overload is the planned increase of training demand over time so your body continues adapting.
Repetition Maximum
Repetition maximum (RM) is the greatest load you can lift for a specified number of repetitions with acceptable form.
Strength Standards
Strength standards are reference benchmarks used to compare lifting performance against population, sport, or cohort norms, often using repetition-maximum data..
Strength Training
Strength training is the planned use of resistance to improve force production, movement capacity, and tissue resilience.
Dynamic Stretching
Dynamic stretching uses controlled movement through available range of motion to prepare tissues and nervous system for upcoming training demands..
Flexibility
Flexibility is the passive range of motion available at a joint or joint chain, influenced by soft tissue properties and nervous-system tolerance..
Mobility
Mobility is the range of motion you can reach and control with your own muscles, in the positions your training or daily life asks for.
Movement Screening
Movement screening is the systematic observation of movement patterns to identify technical constraints, asymmetries, and potential risk factors that may affect training quality and injury-prevention planning..
Muscle Imbalance
Muscle imbalance refers to differences in strength, control, or activation patterns between related muscles or sides of the body that alter movement quality and often appear in movement-screening findings..
Static Stretching
Static stretching is holding a muscle-tendon unit in an elongated position for a defined duration to increase tolerance to range and improve passive flexibility..
Warm-Up
A warm-up is the preparation between arriving at training and your first working effort.
Active Recovery
Active recovery is low-intensity movement performed between hard training bouts to support circulation, reduce stiffness, and restore readiness without adding meaningful fatigue or extending recovery-time..
Circadian Rhythm
A circadian rhythm is a cycle of close to 24 hours in physiology and behavior that your body generates on its own and resets every day from outside time cues, mainly light.
Detraining
Detraining is the partial loss of fitness and performance capacity that occurs when training stimulus is reduced or removed.
Injury Prevention
Injury prevention is the process of reducing avoidable injury risk by managing training load, movement quality, recovery behavior, and context-specific risk factors..
Overreaching
Overreaching is a short-term drop in performance caused by an accumulation of training and non-training stress, from which full performance returns after several days to several weeks.
Recovery Heart Rate
Recovery heart rate, usually called heart rate recovery (HRR), is how many beats per minute your heart rate falls in the first one or two minutes after you stop exercising.
Recovery Time
Recovery time is the period required to restore sufficient readiness after training stress so the next key session can be executed with quality..
Self-Myofascial Release
Self-myofascial release (SMR) is the use of tools such as foam rollers or massage balls to apply pressure to soft tissue for short-term changes in discomfort, perceived stiffness, and range of motion..
Sleep Hygiene
Sleep hygiene is the set of behaviors and environment controls that improve your ability to fall asleep, stay asleep, and achieve restorative sleep quality, which you can monitor with sleep-tracking..
Sleep Stages
Sleep stages are the distinct brain states you pass through while asleep, scored in a sleep lab as wake, three stages of non-REM sleep (N1, N2 and N3) and REM sleep.
Sleep Tracking
Sleep tracking is the overnight measurement of when you sleep, how long you sleep and how often you wake, estimated by a wearable or bedside device from body movement, heart rate and other physiological signals.
Goal Setting
Goal setting is the process of defining desired outcomes and translating them into measurable, time-bound, and behavior-linked targets..
Mental Resilience
Mental resilience is the learned ability to stay effective when training gets hard, plans break, or outcomes disappoint.
Stress Management
Stress management is the deliberate control of total stress load from training and life demands to preserve performance, recovery, and well-being through practices like sleep-hygiene..
Aerobic Capacity
Aerobic capacity is your ability to produce energy with oxygen during sustained work.
Anaerobic Threshold
Anaerobic threshold is the highest intensity at which lactate appearance and lactate removal remain close enough that blood lactate can stay near steady for a meaningful duration.
Endurance
Endurance is your ability to sustain useful output for a long period without unacceptable drop in pace, power, or movement quality.
Lactate Threshold
Lactate threshold is the exercise intensity at which lactate starts to build up in your blood faster than your body clears it.
Zone 2
Zone 2 is a steady endurance intensity just below your first lactate threshold, where blood lactate stays near 2 mmol/L or lower, you can still speak in full sentences, and fat supplies a large share of your energy.
