If performed right, this is a technically professional movement to the extent of being a wonderful blend of art and science. It is worth spending time perfecting the different components of this movement before focusing on the complete movement of the Clean.
With a continuously running clock do one 135 pound Clean and Jerk the first minute, two 135 pound Clean and Jerks the second minute, three 135 pound Clean and Jerks the third minute... continuing as long as you are able.
The barbell goes from ground to overhead, passing through a front squat in which the crease of the hip passes below the height of the kneecap. The finish position is with the arms, hips and knees fully extended, arms overhead, with at least a portion of the ear visible in front of the arm. Dropping the barbell is acceptable.