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-- Lie faceup on floor with right knee bent, foot flat, and left leg extended toward ceiling. Fold tube in half, then loop it around left arch and grasp ends together with both hands.
-- Roll torso off floor slowly to sit up; try to use abs, rather than pulling with arms, by drawing navel into spine.
-- Hold for 1 to 3 counts, then engage abs to roll slowly back down to start.
-- Do 8 reps. Switch legs; repeat.