The performance of an individual is the result of the integrated and harmonious functioning of several dynamic processes of the body, which are either physiological, Psychological, psycho-physiological or biochemical in nature. Along with these the environmental conditions such as climate, attitude, altitude, temperature, humidity etc. may also have their effect on the performance of an individual. Further, there are some “performance variables” which are those conditions that supposedly affect performance i.e., they may temporarily depress of elevate performance and are quite transient in nature such as fatigue, warm-up, place bio-effect, superstitious behavior, pain tolerance, over load effect, genetics, childhood experience, personal goals, dietetics, type of training, competition and other interactions lead to the state of excellence in performance. Out of the factors mentioned, the biological phenomenon is the foremost which fluctuates periodically and is quite prone to the diurnal variations which may be the circadian rhythm or biological clock.