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Absolute Strength: The maximum force that an individual's muscle can produce is a single voluntary effort, regardless of the rate of force production.
Abduction: Movement away from the midline of the body.
Abdomen: The region between the diaphragm and the pelvis.
Acupuncture: A practice, chiefly in Chinese medicine, of attempting to cure illness or relieve pain by puncturing specific areas of the skin with needles.
Acute: Sharp, brief or severe; the initial stage of an injury.
Adaptation: To adjust to new conditions.
Adduction: Movement toward the midline of the body.
Adhesion: The abnormal union of body tissues that are normally separate (similar to scar tissue).
Adipose: Fatty substance
Aerobic Exercise: Exercise occurring in the presence of molecular oxygen in the muscle.
Afferent Neuron: Sensory neuron carrying information toward the central nervous system.
Agility: Ability to start, stop, and move the body quickly in different directions.
Agonist: A muscle responsible for producing a specific movement through concentric muscle action.
Amino Acids: A class of organic compounds that are building blocks from which protein is constructed.
Anaerobic Exercise: Exercise occurring in the absence of molecular oxygen in the muscle.
Anatomical Position: Standing erect, with feet and palms facing forward.
Anorexia Athletica: The use of excessive exercise to lose weight, normally associated with anorexia nervosa.
Anorexia Nervosa: An eating disorder characterized by a distorted body image in which a person does not take in a sufficient amount of calories, eventually causing harm to the body, and sometimes death.
Antagonist: A muscle responsible for opposing the concentric muscle action of the agonist.
Anterior Tilt: Pelvic tilt in which the vertical plane through the anterior-superior spines is anterior to the vertical plane through the symphysis pubis.
Anterior: Anatomical term referring to the front of the body; toward the front.
Appendage: A structure attached to the body such as the upper and lower extremities.
Arthritis: Inflammation of a joint.
Articulation: A joint or connection of bones.
ASIS: Anterior Superior Iliac Spine.
Asymmetrical: Imbalance of the arrangement of parts. Not moving together.
Atrophy: Wasting away of any part, organ, tissue or cell.
Autogenic Inhibition: Inhibition of the muscle spindle resulting from the Golgi tendon organ stimulation.
Avascular: Without blood supply.
Avulsion: Forceful tearing away of any part of a structure.