195
FIGURE 4.30 Lumbar-pelvic rhythm and the roll-
down. (A) Roll-down with body weight back, (B) roll-
down with more desirable placement.
FIGURE 4.31 Flat back position. (A) Standing with co-contraction of abdomi-
nals and back extensors, (B) kneeling with inadequate abdominal contrac-
tion, (C) kneeling with adequate abdominal contraction.