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G L O S S A R Y
G L O S S A R YClear definitions for a longer, healthier life—From A to Z.
The science of aging well is evolving fast, and we’re here to help you keep up.
Don’t see a word you want to know more about? Write and tell us.
A
Gentle movement between workouts to aid in muscle recovery.
Herbs or compounds that help the body resist stress.
Reducing inflammation, which contributes to better overall health.
The body’s process of cleaning out damaged cells and regenerating new ones.
A powerful emotion of wonder that enhances well-being and connection.
B
Exercises that improve coordination, reduce fall risk, and enhance mobility.
Optimizing biology using science, technology, and lifestyle changes.
A key indicator of bone strength and fracture risk.
Intentional breathing exercises that reduce stress and improve focus.
Physical or emotional exhaustion from chronic stress.
C
A marker of inflammation in the body linked to chronic disease.
Your body’s internal clock that regulates sleep and wake cycles.
The brain’s resilience to aging and damage through learning and mental stimulation.
Cold water immersion to enhance recovery and reduce inflammation.
A hormone that helps manage stress, energy, and alertness.
D
The most restorative sleep stage where the body repairs and grows.
A healthy gut that supports nutrient absorption and immune function.
A neurotransmitter linked to motivation, pleasure, and learning.
Movement-based stretches that prepare the body for exercise.
E
The lengthening phase of a muscle contraction, important for strength and joint health.
The ability to navigate life’s challenges with flexibility.
Mood-boosting chemicals released by the brain during exercise or joy.
The relationship between calories consumed and expended.
The study of how lifestyle influences gene expression.
Positive stress that enhances growth and resilience.
F
Connective tissue that supports muscles and helps with movement.
Muscle fibers used in quick, explosive movements.
The period when eating is restricted during intermittent fasting.
A state of optimal focus and performance.
Strength that translates to everyday tasks and movements.
G
A calming neurotransmitter that supports relaxation and sleep.
A term for muscle's role in absorbing glucose to regulate blood sugar.
How a food impacts blood sugar levels.
A key marker of strength and predictor of longevity.
The two-way communication between your digestive system and brain.
H
The number of years you live in good health, free from chronic illness or disability.
Conditions affecting heart health and circulation.
A sign of nervous system balance and stress recovery.
The increase in muscle size through training.
I
Your body's response to an illness, injury or something that doesn't belong in your body (like germs or toxic chemicals).
A condition where cells in the muscles, fat, and liver don't respond properly to insulin, leading to impaired insulin sensitivity and potentially prediabetes or type 2 diabetes.
How effectively your body uses insulin, which regulates blood sugar levels
A group purposefully designed for shared values and support.
An eating pattern alternating between fasting and eating periods.
J
Extracting juice from fruits and vegetables for nutrition.
K
A metabolic state where the body burns fat for fuel instead of glucose.
How muscles and joints work together during movement.
L
The exercise point when lactic acid starts to accumulate.
Muscle and other non-fat tissues that contribute to physical function.
Medical care that focuses on preventing disease with lifestyle changes.
The brain area responsible for processing emotions, memory, and motivation.
Living a long life; influenced by genetics, environment, and lifestyle.
A massage technique that encourages the natural drainage of the lymph, reducing swelling and promoting detoxification.
M
The body's ability to efficiently switch between using carbohydrates and fats as fuel sources, adapting to changes in energy supply and demand.
The community of microorganisms (bacteria, viruses, fungi) living in a particular environment, especially the gut.
The practice of paying attention to the present moment with non-judgmental awareness.
Organelles in cells responsible for producing energy (ATP), often called the powerhouse of the cell.
The ability to move freely and easily through a full range of motion.
The total weight of muscle in your body, critical for longevity.
N
A molecule involved in cellular energy and longevity.
The brain’s ability to change and adapt through experience.
A food’s concentration of beneficial nutrients per calorie.
O
Essential fats that reduce inflammation and support brain health.
The ideal amount of weight or resistance for safe and effective strength training.
A hormone that promotes bonding, trust, and connection.
P
The part of your nervous system that supports relaxation and digestion.
A deeply meaningful and awe-inspiring life moment.
The transitional period before menopause when hormonal shifts begin.
Plant compounds that act as antioxidants.
The stage of life after menopause, marked by lower estrogen levels.
Live bacteria that promote gut and immune health.
Gradually increasing workout intensity to build strength and endurance.
Q
The large muscles on the front of the thighs.
A calm, focused state free of mental chatter.
R
The use of low-wavelength red light to promote healing.
The practice of cultivating mindfulness within the context of engaged, person-to-person relationships.
The ability to recover quickly from stress or setbacks.
The number of breaths taken per minute.
The body’s natural relaxation and recovery mode.
S
The ability to manage emotions and actions consciously.
A mindful, intentional approach to daily life.
Resistance-based exercise to build muscle and support healthy aging.
The act of thriving and optimizing health, vitality, and purpose as you age.
A nutrient-rich food that offers health benefits.
T
The body’s process of generating heat, often through exercise or cold exposure.
V
The health of the vagus nerve, which helps regulate stress.
A vitamin essential for bone health and immune function.
A measurement of how much oxygen your body can use during exercise.
W