This paper presents some practicalities and established norms for isokinetic exercise. Reliability and validity of the isokinetic device were determined for measurements of torque, work, range of motion, and power. These parameters were evaluated for the conditions under which isokinetic exercise was employed to establish norms and to evaluate the effectiveness of that exercise in increasing muscular strength. The norms are given for the quadriceps and hamstring muscle groups of normal young subjects. They pertain to force through the range of motion at varying speeds of contraction. The practicalities include objective comparison of effects of isokinetic exercise and two types of conventional exercise.