The paper revisits the main features of physical performance from a chrono-medical perspective. Classic and up-to-date evaluation tests (electromyography, neuromuscular efficiency, rating of perceived exertion, ERGOJUMP tests, torque) are mentioned together with their interpretation against the general biorhythm behavioural background of the organism. Conclusions point out the importance of considering biorhythm influence upon different physiological variables or parameters in order to further improve overall human psycho somatic condition and performance.