Skinfold Caliper:
An instrument used to measure a selected thickness of a fold of skin that has been pinched up on the body.

Slow Twitch Muscle Fiber:
This is a type of muscle fiber with slow contractile characteristics. They have a high capacity to use oxygen. These fibers are used primarily during endurance type activities such as running, swimming, and cycling.

Static Stretching:
Increasing the length of a particular muscle or muscle group.

Step Aerobics:
This is a form of aerobics that is described as low impact and high intensity. It involves stepping on and off a bench ranging in height from four to twelve inches using a variety of step and arm combinations to music.

Step Test:
A testing procedure for assessing the heart-rate recovery after stepping on and off a bench for a three minute time period at a predetermined cadence.

Strength:
The capacity of a muscle to exert a force against a resistance.

Snatch Olympic lift where weight is lifted from floor to overhead, (with arms extended) in one continuous movement.

Spot Assist if called upon by someone performing an exercise.

Spotter Person who watches a person closely to see if any help is needed during a specific exercise.

Sticking Point Most difficult part of a movement.

Straight Sets Groups of repetitions (SETS) interrupted by only brief pauses, (30-90) seconds.

Strength Training Using resistance weight training to build maximum muscle force.

Stretch Marks Tears (slight scars) in skin caused if muscle or fat tissue has expanded in volume faster than the skin can grow.

Striations Grooves or ridge marks seen under the skin, the ultimate degree of muscle definition.

Stroke A condition which occurs from insufficient oxygen supply to the brain.

Super Set Alternating back and forth between two exercises until the prescribed number of sets is completed.

Sympathetic Nervous System Part of the autonomic nervous system that prepares the body for activity by speeding up the heart rate.

Saturated Fat fats whose carbon atoms contain all of the hydrogen atoms they can;considered a contributory factor in atherosclerosis

Secondary diabetes mellitus rare disease caused by certain drugs or disease of the pancreas

Secondary hypertension high blood pressure caused by another condition such as kidney disease

Serum cholesterol cholesterol in the blood

Set Point Theory belief that everyone has a natural weight ("set point") at which the body is most comfortable

Stomach Banding surgical reduction of stomach, but to lesser degree than bypass