Set at maximum resistance level and attach both straps.
Starting Position
Lie on back with both feet in one loop each.
Execution
Lift pelvis off floor with legs initially extended. Arms are placed lengthwise from the body on the floor. With trunk tension, alternately pull the heels toward the buttocks. The pelvis remains up.
Hint
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Variants
Pulling both heels toward the buttocks at the same time offers even more challenge.