This part of the practice is done entirely by the LEFT HAND. The right hand is NOT used. The purpose of this exercise is to train the hand to make, or finger, the chord. Once the C chord is made, do it a number of times in the following order. Remember your training the hand to make the C chord.
HAMMER the fingers down, one at a time, in the order in which the string would normally be sounded in a chord when playing simple rhythm.