| AEROBIC |
Energy created with oxygen, or in the presence of oxygen. |
| ANAEROBIC |
Energy created without oxygen, or in the absence of oxygen. |
| CAPILLARIES |
The smallest blood vessels where oxygen, foods, and hormones enter the cells and carbon dioxide and wastes are removed. |
| ENDORPHINS |
A brain chemical that eases or suppresses pain. |
| FATIGUE |
A generalized or specific feeling of tiredness that may have a multitude of causes both mental and physical. |
| FLEXIBILITY |
That property of muscles and connective tissue which allows full range of motion. |
| MUSCLE TONE |
Muscle firmness in the absence of a voluntary contraction. |
| MYOFIBRIL |
One of many fibrils consisting mainly of protein that fill a muscle fiber. |
| PROGRESSIVE RESISTANCE |
A program in which the amount of resistance is regularly increased as the muscles gain in strength; maintaining continual overload. |
| STROKE VOLUME |
The amount of blood ejected by a ventricle of the heart with one beat. |
| WORKLOAD |
The total of resistance as measured by time and/or effort into days, weeks, or months. |
IMPORTANT STS WORD DEFINITIONS