left hook - right uppercut
Following the right cross is the left hook, a short punch using all the power contained in the quick turn of one's waist to the right. The left arm punches parallel to the ground, ending in front of one's eye. Note the correct pivot of the lead or left foot, in the second frame, needed to secure the power of this punch.

Similarly, the right uppercut, requires a pivot on the rear or right foot (third image) for a powerful twist of the waist to the left. Like the hook, the uppercut never winds up behind one's ribs; it begins at one's side and quickly snaps to the opponent's chin ending in front of one's eye.

above: left hook overviews; correct and incorrect left hook in side view; uppercut, rear and front views.

right: bag slip