Begin by lying on a foam roller. Alternatively, you may use a half roller with the flat side up and rounded side down. Once the body is stable, slowly flex the right hip and reach with the left arm to touch the right foot. For this movement, the emphasis should be on the quality of movement with constant tension in the abdominal muscles. If the low back is hyperextended (i.e. arched), then perform a traditional abdominal crunch while lying on the foam roller.