It is the prevention of injury that makes this field so important. With the rapidly growing number of amateur athletes entering the sports community today, proper technique and comprehensive knowledge of the problems associated with various types of exercise and sport, as well as with the anatomy and physiology, involved is a necessity. Biomechanics is often the link pulling together all the aspects of the field to create a much more successful endeavor. Physical fitness is the result of regular exercise. Flexibility is the body's ability to extend and flex its major joints.
Body composition is the body's proportion of fat and muscle mass.
Each of these components contributes to one's level of physical fitness. Certain types of exercise have a greater impact on a specific component, while others give a broader range of benefits. In general, a regular and balanced exercise routine will benefit all four areas of fitness. When pain starts, stop and rest. Sometimes a bandage or sling can hold the muscle in place so that it can rest.