Health / Fitness Glossary

Inertia: The tendency of a body at rest to remain at rest or a body in motion to remain in motion unless disturbed by an external force.

Intensity: Amount of degree of energy, strength, or force.

Interval Training: A training technique in which you alternate short, fairly intense spurts of exercise with periods of relatively easy exercise.

Iso Kinetic: Exercise Isotonic exercise in which there is ACCOMMODATING RESISTANCE. Also refers to constant speed. Nautilus and Cybex are two types of iso kinetic machines, where machine varies amount of . . . View Full Definition

Isolation Exercise: Weight lifting exercise that stimulate just a single muscle group. Good for defining a muscle.

Isometric: Muscle contraction in which the muscle tension increase, but without change in the muscle length.

Isometric Exercise: Muscular contraction where muscle maintains a constant length and joints do not move. These exercises are usually performed against a wall or other immovable object.

Isotonic: Muscle contraction in which the muscle tension increase, with change in the muscle length.

Isotonic Exercise: Muscular action in which there is a change in length of muscle and weight, keeping tension constant. Lifting free weights is a classic isotonic exercise.

Kinesiology: Study of anatomy and mechanics of the human moviment.

Knee Wraps: Elastic strips about 3 1/2' wide used to wrap knees for better support when performing squats, dead lifts, etc.

Lactic Acid: A substance caused by anaerobic training of the muscles, a build up prevents continuation of exercise, and a good example is 400 metre runners. Watch how they slow down during the last 100 m . . . View Full Definition

Lats: Abbreviation for Latissimus dorsi, the large muscles of the back that move the arms downward, backward and in internal rotation.

Lean Body Mass: Everything in the body except for fat, including bone, organs, skin, nails and all body tissue including muscle. Approximately 50-60% of lean body mass is water.

Lifestyle: Individual patterns of your typical life.

Lifestyle Walking: A casual walking technique that is low to moderate intensity and relatively slow paced. Most lifestyle walkers walk an average of 2.5 to 3.5 miles per hour, which means that they walk about . . . View Full Definition

Lift Off: Assistance in getting weight to proper starting position.

Ligament: Strong, fibrous band of connecting tissue connecting two or more bones or cartilage or supporting a muscle, fascia or organ.

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