Clinical Examination Clinical methods are useful for screening the unfit, but clinical methods do not differentiate among those who are fit. The patient in a clinical examination is at rest and in a situation dissimilar to the one in which he normally acts. An accurate estimate of his anatomical fitness may be made, but his physiological and psychological fitness is not accurately assessed by clinical methods. Functional Tests Functional tests are only slightly more significant than clinical methods in evaluating at less. The activity performed in the test and the test conditions usually do not represent tile activity or the conditions for which fitness is to be evaluated. Even when test conditions closely approximate tile working conditions, the responses of the various systems to the test activity are often unreliable for example, repetition of exercise at weekly intervals accelerated the recovery of the pulse rate but produced no change in performances; improvement of performance in a three mile run in young soldiers during six months of military training no relation to the vital capacity, breath holding time, resting pulse, and post exercise pulse; the trends or' metabolic and circulatory functions were not uniform when work loads on a bicycle ergometer were continuously increased until the subject was forced to quit from exhaustions with such evidence, fitness test scores must be interpreted with caution. Present functional tests of fitness use an exercise as the stress and employ the recovery pulse as an index of the response of the physiological mechanisms. These tests obviously do not assess all of the elements of anatomical, physiological, or psychological fitness, nor do they closely approximate any particular stress. They are rough. measures of fitness for physical activity and thus are given the very general name of physical fitness tests. Two concepts presented underlie present measurements of physical fitness. "First, there are some quantitatively measurable differences between the fit and the unfit. Second, (certain) fundamental physiological adaptations common to fitness for all types of exertion can be distinguished from the special skills necessary for the successful performance of different types of physical endeavor."		Home Components of Physical Fitness Clinical Examination Differences Between Fit and Unfit Men Physiological Elements of Fitness The Step Test The Effects of Training on the Physiological Systems Work Output Physical Condition of Muscle Application of Muscular Force Maintaining Optimum Strength Tests of Muscular Strength Strength and appearance Strength as a measure of physical fitness Strength as affected by organic problems Strength as prophylaxis Role of inactivity in production of disease Lack of Sociability in Work Lactic Acid System Muscular Form Capillary Growth Heart Size Heart Rate Training produces physicochemical changes Muscular Strength Nervous Stimulation and Muscular Strength Quality of Champions Factors Which Limit Skill Kinesthesis Balance Reaction Time Muscular Tension Visual Aim Skill Center in the Brain Distribution of Energy