| Anaerobic Exercise | Anaerobic means "in the absence of oxygen". Anaerobic exercise is performed at an intensity so great that the body's demand for oxygen exceeds its ability to supply it.
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| Definition of Muscle | The detailed external appearance of a muscle.
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| Ergogenic Aids | Substances, strategies, or treatments that are theoretically designed to improve performance in sports or competitive athletics.
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| Hyperkinetic conditions | Condition caused by too much physical activity and/or insufficient rest.
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| Interval training | A training technique often used for high-level aerobic and anaerobic training; technique uses repeated bouts of activity followed by rest to maximize the quality of the workout.
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| Lactic Acid | Substance that results from the process of supplying energy during anaerobic exercise; a cause of muscle fatigue.
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| Long Slow Distance (LSD) Training | Training technique that emphasizes long, slow, distance. It is used by marathon runners and other endurance performers.
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| Motor Fitness (Sports Fitness) | Skill-related physical fitness.
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| Oxygen Debt | A term used to describe the body's ability to use high-energy fuel in anaerobic exercise without the presence of oxygen, and its ability to supply oxygen after the exercise to rebuild the supply of high-energy fuel.
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| Plyometrics | A training technique used to develop explosive power. Referred to as "speed-strength training in Eastern Europe and the former Soviet Union, where it originated. It consists of concentric isotonic contractions performed after a pre-stretch or eccentric contraction of a muscle.
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| Proprioception | Awareness of body movements and orientation of the body in space; often used synonymously with kinesthesis.
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| Tapering | A reduction in training volume and intensity that is used prior to competition to elicit peak performance.
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| Training | The type of physical activity performed by people interested in high level performance - e.g., athletes, those in specialized jobs.
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