A well-designed core training program will address all parts of the movement sub-systems and rely on a client's specific movement pattern dysfunctions (do not forget to conduct your dynamic movement assessments). For instance, a client with an anterior pelvic tilt would not necessarily benefit from exercises that work the hip flexors (i.e., leg raises). Similarly, a client with a lordosis may not benefit from exercises that target the spinal extensors (i.e., back extensions).