Combining two complex exercises - lunges and rev. peck deck - shape your buttocks, hips, thighs and back.
Single exercises: upper back
handles: upper pulley, seat: mid calves
By combining two basic exercises - squatting and rowing - you will reach shaped back and legs in a half of your time.
Strengthening the buttocks, thighs and calves in combination with strengthening the back muscles in one exercise. Save your time with complex exercises like this.