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-- Sit on floor with knees slightly bent, feet hip-width apart, and heels planted.
-- Loop center of tube around arches of feet, cross it once or twice in front of you, then grasp a handle in each hand, elbows bent 90 degrees and tucked by sides, palms facing up.
-- Keeping abs tight throughout, lean torso back about 45 degrees and slowly curl handles to shoulders. Make it harder: Hold for 3 seconds.
-- Hinge forward at hips slightly as you extend both arms behind you, keeping elbows close to body, to complete one rep. (Exercise pros can hold here for another 3 seconds.)
-- Do 16 reps.