Lying on the back with knees bent to 90 degrees, arms extended
sideward at 45 degrees and feet on the marching surface, perform the
drawing–in maneuver. Once the abdominal contraction is established,
raise the hips off of the ground until the trunk and thighs form a
generally straight line. The spine must not arch to achieve this position.
With the buttocks still up, straighten the left leg until it comes in line
with the trunk and thigh. Don’t let the trunk and pelvis sag on the
unsupported side. Hold five seconds, then switch to the other leg.
Repeat for one minute. If the spine begins to sag, arch, or tilt, lower to
the Starting Position, rest for 3–5 seconds, then, try again.
sideward at 45 degrees and feet on the marching surface, perform the
drawing–in maneuver. Once the abdominal contraction is established,
raise the hips off of the ground until the trunk and thighs form a
generally straight line. The spine must not arch to achieve this position.
With the buttocks still up, straighten the left leg until it comes in line
with the trunk and thigh. Don’t let the trunk and pelvis sag on the
unsupported side. Hold five seconds, then switch to the other leg.
Repeat for one minute. If the spine begins to sag, arch, or tilt, lower to
the Starting Position, rest for 3–5 seconds, then, try again.
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